The document provides information about the upcoming August 21, 2017 total solar eclipse, including key times and locations to view it, safety tips for viewing, and what phenomena can be observed. The eclipse will be visible across the United States, with the path of totality stretching from Oregon to South Carolina. Key events along the path include first contact at 1:06 PM, totality beginning at 2:35 PM lasting 2 minutes 13 seconds, and fourth contact at 4:00 PM from Brasstown Bald in Georgia. Proper solar filters are required to safely observe the partial phases, while the corona can only be viewed without filters during the brief period of totality.
The document discusses different types of solar eclipses: partial solar eclipses where only part of the sun is blocked by the moon; annular eclipses where the moon appears smaller allowing light to shine around the edges; and total lunar eclipses where the moon passes into the Earth's shadow. It provides information on the next solar eclipse over the US in 2024 and resources from NASA on visualizing and tracing the 2017 eclipse path. Safety tips are outlined for viewing a solar eclipse, including eye protection, layers of clothing, food, water, and first aid supplies.
An eclipse occurs when one celestial body blocks the light of another from an observer's perspective on Earth. There are two main types - solar eclipses where the moon passes in front of the sun, and lunar eclipses where the moon passes through the Earth's shadow. During a solar eclipse, the moon's shadow falls on parts of Earth and the sun appears darkened; there are three types depending on how much of the sun is covered. A lunar eclipse is visible over a larger area as the moon passes through the Earth's shadow and takes on a reddish hue. Eclipses can last up to seven minutes and a total solar eclipse occurs about every 1.5 years.
The document provides an overview of lunar phases, eclipses, and tides. It explains that the moon orbits at an angle relative to Earth's orbit and reflects sunlight, causing phases. Eclipses occur when the sun, earth, and moon align, sometimes blocking sunlight. Total lunar eclipses make the moon appear red due to atmospheric filtering of light. The moon's gravity also causes two high tides each day by pulling the side of Earth closest and farthest to it.
An eclipse occurs when one astronomical object passes in front of another, temporarily obscuring it from view. There are two types of eclipses - solar eclipses, which occur when the moon passes between the earth and sun, and lunar eclipses, which occur when the earth passes between the sun and moon. The document provides instructions for safely viewing an eclipse using a pinhole projector or solar filter to project the sun's image without looking directly at it.
An eclipse occurs when a celestial body passes in front of the sun, blocking its light. There are two types of eclipses: lunar eclipses, where the earth casts a shadow on the moon, and solar eclipses, where the moon casts a shadow on earth. During a lunar eclipse, the earth blocks the sun's light from reaching the moon, causing it to glow red. A total lunar eclipse occurs when the moon passes completely into the earth's shadow, while a partial lunar eclipse happens when it only partially enters the shadow.
This document discusses shadows, solar eclipses, and lunar eclipses. There are four types of solar eclipses: total, annular, hybrid, and partial. During a total solar eclipse, the moon completely obscures the sun, allowing the solar corona to be seen. An annular solar eclipse occurs when the moon is not large enough to completely cover the sun, leaving a ring of sunlight visible. A hybrid eclipse shifts between total and annular. A partial solar eclipse occurs when the moon only partially obscures the sun. There are also three types of lunar eclipses: total, partial, and penumbral.
The document discusses eclipses and provides myths and legends about them from different cultures. It explains that solar eclipses occur when the moon passes between the Earth and sun, casting its shadow on Earth. Lunar eclipses occur when the Earth passes between the sun and moon, and the Earth's shadow is cast on the moon. The document suggests doing a hands-on activity using balls and lamps to observe how eclipses are formed and includes links to NASA videos and worksheets on eclipses.
There are two types of eclipses: solar and lunar. A lunar eclipse occurs when the moon passes into the Earth's shadow, appearing red or dark. A solar eclipse happens when the moon passes between the Earth and sun, casting its shadow on Earth. There are three types of each: total, partial, and penumbral/annular. Lunar eclipses are more common as anyone experiencing nighttime can see it, while only a small area experiences a solar eclipse due to the moon's small umbral shadow. Eclipses occur during eclipse seasons when the sun, Earth, and moon are directly aligned.
The document discusses different types of solar eclipses: partial solar eclipses where only part of the sun is blocked by the moon; annular eclipses where the moon appears smaller allowing light to shine around the edges; and total lunar eclipses where the moon passes into the Earth's shadow. It provides information on the next solar eclipse over the US in 2024 and resources from NASA on visualizing and tracing the 2017 eclipse path. Safety tips are outlined for viewing a solar eclipse, including eye protection, layers of clothing, food, water, and first aid supplies.
An eclipse occurs when one celestial body blocks the light of another from an observer's perspective on Earth. There are two main types - solar eclipses where the moon passes in front of the sun, and lunar eclipses where the moon passes through the Earth's shadow. During a solar eclipse, the moon's shadow falls on parts of Earth and the sun appears darkened; there are three types depending on how much of the sun is covered. A lunar eclipse is visible over a larger area as the moon passes through the Earth's shadow and takes on a reddish hue. Eclipses can last up to seven minutes and a total solar eclipse occurs about every 1.5 years.
The document provides an overview of lunar phases, eclipses, and tides. It explains that the moon orbits at an angle relative to Earth's orbit and reflects sunlight, causing phases. Eclipses occur when the sun, earth, and moon align, sometimes blocking sunlight. Total lunar eclipses make the moon appear red due to atmospheric filtering of light. The moon's gravity also causes two high tides each day by pulling the side of Earth closest and farthest to it.
An eclipse occurs when one astronomical object passes in front of another, temporarily obscuring it from view. There are two types of eclipses - solar eclipses, which occur when the moon passes between the earth and sun, and lunar eclipses, which occur when the earth passes between the sun and moon. The document provides instructions for safely viewing an eclipse using a pinhole projector or solar filter to project the sun's image without looking directly at it.
An eclipse occurs when a celestial body passes in front of the sun, blocking its light. There are two types of eclipses: lunar eclipses, where the earth casts a shadow on the moon, and solar eclipses, where the moon casts a shadow on earth. During a lunar eclipse, the earth blocks the sun's light from reaching the moon, causing it to glow red. A total lunar eclipse occurs when the moon passes completely into the earth's shadow, while a partial lunar eclipse happens when it only partially enters the shadow.
This document discusses shadows, solar eclipses, and lunar eclipses. There are four types of solar eclipses: total, annular, hybrid, and partial. During a total solar eclipse, the moon completely obscures the sun, allowing the solar corona to be seen. An annular solar eclipse occurs when the moon is not large enough to completely cover the sun, leaving a ring of sunlight visible. A hybrid eclipse shifts between total and annular. A partial solar eclipse occurs when the moon only partially obscures the sun. There are also three types of lunar eclipses: total, partial, and penumbral.
The document discusses eclipses and provides myths and legends about them from different cultures. It explains that solar eclipses occur when the moon passes between the Earth and sun, casting its shadow on Earth. Lunar eclipses occur when the Earth passes between the sun and moon, and the Earth's shadow is cast on the moon. The document suggests doing a hands-on activity using balls and lamps to observe how eclipses are formed and includes links to NASA videos and worksheets on eclipses.
There are two types of eclipses: solar and lunar. A lunar eclipse occurs when the moon passes into the Earth's shadow, appearing red or dark. A solar eclipse happens when the moon passes between the Earth and sun, casting its shadow on Earth. There are three types of each: total, partial, and penumbral/annular. Lunar eclipses are more common as anyone experiencing nighttime can see it, while only a small area experiences a solar eclipse due to the moon's small umbral shadow. Eclipses occur during eclipse seasons when the sun, Earth, and moon are directly aligned.
This document provides information about viewing the total solar eclipse that will occur on August 21, 2017 across the United States. It details what viewers in Georgia will be able to see, even if not in the direct path of totality. It also shares information on planetarium showings about the eclipse, frequently asked questions, myths surrounding solar eclipses, how to view and photograph the eclipse safely, and resources for further research available through the library.
1) Eclipses occur when one celestial body blocks the light from another. Lunar eclipses happen during a full moon when the Earth casts its shadow on the moon. Solar eclipses occur during a new moon when the moon passes between the Earth and sun.
2) There are three types of lunar eclipses - total, partial, and penumbral - and three types of solar eclipses - total, partial, and annular.
3) Eclipses do not occur every month because the moon's orbit is tilted relative to the Earth's orbit around the sun. Lunar eclipses are more frequent than solar eclipses.
This document discusses eclipses, including lunar and solar eclipses. It explains that eclipses occur when the sun, earth, and moon are aligned so that one celestial body casts a shadow on the other. A lunar eclipse can only happen during a full moon, while a solar eclipse can only happen during a new moon. The document outlines the different types of solar eclipses and provides safety precautions for viewing a solar eclipse directly.
There are two types of eclipses - solar and lunar. A solar eclipse occurs when the moon passes between the earth and sun, while a lunar eclipse happens when the earth is between the sun and moon. Eclipses form when the three celestial bodies are aligned in a straight line. An eclipse can be total in the umbra region of complete shadow or partial in the penumbra region of partial shadow.
A lunar eclipse occurs when the Moon passes through the Earth's shadow. There are three types of lunar eclipses - total, partial, and penumbral - depending on how much of the Moon passes through the Earth's umbra or penumbra. During a total lunar eclipse, the Moon takes on a red color due to refraction of sunlight through the Earth's atmosphere. A solar eclipse occurs when the Moon passes between the Earth and the Sun, casting its shadow on parts of Earth. There are also three types of solar eclipses - total, partial, and annular - depending on the Moon's position and alignment with the Earth and Sun.
A "lunar eclipse" and a "solar eclipse" refer to events involving three celestial bodies: the Sun ("solar"), the moon ("lunar"), and the Earth. A lunar eclipse occurs when the Earth passes between the Moon and the Sun, and the Earth's shadow obscures the moon or a portion of it. A solar eclipse occurs when the Moon passes between the Earth and the Sun, blocking all or a portion of the Sun.
The document discusses lunar and solar eclipses. It explains that lunar eclipses occur when the Earth passes between the sun and moon, casting its shadow on the moon. Solar eclipses occur when the moon passes between the Earth and sun, casting its shadow on parts of Earth. Eclipses only occur when the sun, Earth, and moon are aligned on the same plane. The document provides details on the conditions required to see each type of eclipse and diagrams demonstrating the geometry of lunar and solar eclipses.
This document summarizes a presentation about solar eclipses, including:
1) It discusses the mythology and beliefs around eclipses in ancient cultures like China, India, and Egypt who saw them as omens. It also covers the mechanics of how eclipses occur.
2) It provides safety guidelines for viewing eclipses, emphasizing the importance of using approved solar filters.
3) It uses computer simulations to show the partial solar eclipse of March 29, 2006 as seen from different locations, and lists some important future eclipses between the present and 2030.
A solar eclipse occurs when the moon passes between the Earth and the sun, blocking the sun's light. There are typically 2-5 solar eclipses per year. There are four types of solar eclipses: total, annular, partial, and hybrid. A total solar eclipse, where the moon completely blocks the sun's light, occurs on average every 18 months and can only be seen from a narrow path on Earth. The longest total solar eclipse of the 21st century occurred on July 22, 2009 and lasted over 6 minutes. Special care must be taken to safely observe a solar eclipse by using eclipse glasses or other filters to view the sun.
The document discusses different types of solar and lunar eclipses, including total, partial, and annular solar eclipses and penumbral, partial, and total lunar eclipses. It provides examples of quotes from historical accounts of eclipses dating back to 1375 BC and explanations of why the moon appears red during a lunar eclipse and the different parts of an eclipse shadow.
The document discusses lunar and solar eclipses. It explains that lunar eclipses occur when the Earth passes between the Sun and Moon, casting its shadow on the Moon. Solar eclipses occur when the Moon passes between the Earth and Sun, casting its shadow on parts of Earth. For an eclipse to occur, the Sun, Moon and Earth must be aligned on the same plane. The document provides details on the conditions required to view lunar and solar eclipses and why the Moon appears red during a lunar eclipse.
An eclipse occurs when one celestial body passes between the sun and another, blocking sunlight or moonlight. There are two main types of eclipses - lunar eclipses, where the moon passes into Earth's shadow, and solar eclipses, where the moon passes between Earth and the sun. During a lunar eclipse, the moon turns red as it is illuminated only by sunlight passing through Earth's atmosphere. A solar eclipse can be partial or total, where the moon completely blocks the sun's light over a small area. Total solar eclipses are rare as the moon's shadow is small and its orbit is tilted relative to Earth's.
There are two types of eclipses: lunar eclipses, which occur when the moon passes into Earth's shadow, and solar eclipses, which occur when the moon passes between Earth and the sun. Lunar eclipses can be total, partial, or penumbral depending on how far into Earth's shadow the moon passes. Solar eclipses can be total, partial, or annular depending on the moon's position in its orbit. Eclipses do not occur every month because the moon's orbit is tilted relative to Earth's orbit around the sun, so the three objects do not align perfectly except during eclipse seasons.
The document discusses lunar eclipses. It defines different types of lunar eclipses including penumbral, partial, and total eclipses. The next visible total lunar eclipse will occur on January 31, 2018 and will be seen in Asia, Australia, the Pacific Ocean, and western North America. During a lunar eclipse, the moon appears red due to Rayleigh scattering, which scatters blue light from the sun more than red light when it passes through the earth's atmosphere. For an eclipse to occur, the moon must pass within 11.38 degrees of the ecliptic plane at either its ascending or descending node where it intersects the ecliptic.
The document discusses eclipses of the sun and moon through various quotes and descriptions. It provides background on solar eclipses, noting that there are three types - annular, partial and total - and details like their frequency and visibility. It also covers lunar eclipses and explains why the moon appears red during an eclipse due to atmospheric filtering of light. Upcoming eclipses are listed, though none will be fully visible from the location.
An eclipse occurs when one celestial body passes between a source of light and another, blocking the light. There are two types of eclipses: solar eclipses, where the moon passes between the earth and sun, and lunar eclipses, where the earth passes between the moon and sun. The moon's shadow during a solar eclipse has two parts - the penumbra, where a partial eclipse can be seen, and the umbra, where a total eclipse occurs.
The document discusses eclipses and Jupiter's moon Ganymede. It begins by asking questions about the earth's movement and astronomical objects. It then defines shadow and discusses umbra and penumbra. It states that Jupiter has 64 moons, and its largest moon Ganymede is about 4.5 billion years old, similar in age to Jupiter. The document presents information on solar and lunar eclipses, noting that solar eclipses can be viewed safely using sunglasses to protect the eyes from the sun's light. It asks students to research and report on eclipses that have occurred in the Philippines.
The document summarizes the motions and phases of the Earth-Moon system. It explains that the moon orbits Earth over the course of about a month in an elliptical orbit, appearing larger when closer (perigee) and smaller when farther (apogee). The changing positions result in the phases of the moon as the illuminated side facing Earth waxes and wanes over the lunar cycle. Eclipses occur when the sun, Earth, and moon align, causing the moon to block the sun during a solar eclipse or Earth to block the sun's light during a lunar eclipse.
This document discusses different types of shadows formed during lunar and solar eclipses. A lunar eclipse occurs when the moon moves into Earth's shadow and is aligned with the sun and Earth. This can result in a blood moon that appears reddish. A solar eclipse happens when the moon is positioned between the Earth and sun, casting its shadow onto a portion of Earth. The document defines umbra, penumbra, and antumbra shadows and how they relate to complete or partial coverage of the moon or sun during different eclipse types. It also examines how the size of the light source and obstacle can impact shadow formation and characteristics.
The document discusses eclipses and Jupiter's moon Ganymede. It begins with an introduction to astronomical objects like planets and asteroids. It then discusses shadows and the terms umbra and penumbra in relation to eclipses. It notes that Jupiter has 64 moons, and that its largest moon Ganymede is around 4.5 billion years old, similar in age to Jupiter. The document includes questions about eclipses and safety tips for viewing a solar eclipse. It concludes with a short assignment to research and report on eclipses in the Philippines.
The document discusses solar eclipses, including their cultural significance, types of eclipses, and how to safely observe them. It provides details on total solar eclipses, explaining the geometry of the sun, earth and moon during an eclipse. It also describes a total solar eclipse observed in Turkey on March 29, 2006, noting the path of totality passed through various regions with over 4 minutes of totality in Antalya.
This document provides information about viewing the total solar eclipse that will occur on August 21, 2017 across the United States. It details what viewers in Georgia will be able to see, even if not in the direct path of totality. It also shares information on planetarium showings about the eclipse, frequently asked questions, myths surrounding solar eclipses, how to view and photograph the eclipse safely, and resources for further research available through the library.
1) Eclipses occur when one celestial body blocks the light from another. Lunar eclipses happen during a full moon when the Earth casts its shadow on the moon. Solar eclipses occur during a new moon when the moon passes between the Earth and sun.
2) There are three types of lunar eclipses - total, partial, and penumbral - and three types of solar eclipses - total, partial, and annular.
3) Eclipses do not occur every month because the moon's orbit is tilted relative to the Earth's orbit around the sun. Lunar eclipses are more frequent than solar eclipses.
This document discusses eclipses, including lunar and solar eclipses. It explains that eclipses occur when the sun, earth, and moon are aligned so that one celestial body casts a shadow on the other. A lunar eclipse can only happen during a full moon, while a solar eclipse can only happen during a new moon. The document outlines the different types of solar eclipses and provides safety precautions for viewing a solar eclipse directly.
There are two types of eclipses - solar and lunar. A solar eclipse occurs when the moon passes between the earth and sun, while a lunar eclipse happens when the earth is between the sun and moon. Eclipses form when the three celestial bodies are aligned in a straight line. An eclipse can be total in the umbra region of complete shadow or partial in the penumbra region of partial shadow.
A lunar eclipse occurs when the Moon passes through the Earth's shadow. There are three types of lunar eclipses - total, partial, and penumbral - depending on how much of the Moon passes through the Earth's umbra or penumbra. During a total lunar eclipse, the Moon takes on a red color due to refraction of sunlight through the Earth's atmosphere. A solar eclipse occurs when the Moon passes between the Earth and the Sun, casting its shadow on parts of Earth. There are also three types of solar eclipses - total, partial, and annular - depending on the Moon's position and alignment with the Earth and Sun.
A "lunar eclipse" and a "solar eclipse" refer to events involving three celestial bodies: the Sun ("solar"), the moon ("lunar"), and the Earth. A lunar eclipse occurs when the Earth passes between the Moon and the Sun, and the Earth's shadow obscures the moon or a portion of it. A solar eclipse occurs when the Moon passes between the Earth and the Sun, blocking all or a portion of the Sun.
The document discusses lunar and solar eclipses. It explains that lunar eclipses occur when the Earth passes between the sun and moon, casting its shadow on the moon. Solar eclipses occur when the moon passes between the Earth and sun, casting its shadow on parts of Earth. Eclipses only occur when the sun, Earth, and moon are aligned on the same plane. The document provides details on the conditions required to see each type of eclipse and diagrams demonstrating the geometry of lunar and solar eclipses.
This document summarizes a presentation about solar eclipses, including:
1) It discusses the mythology and beliefs around eclipses in ancient cultures like China, India, and Egypt who saw them as omens. It also covers the mechanics of how eclipses occur.
2) It provides safety guidelines for viewing eclipses, emphasizing the importance of using approved solar filters.
3) It uses computer simulations to show the partial solar eclipse of March 29, 2006 as seen from different locations, and lists some important future eclipses between the present and 2030.
A solar eclipse occurs when the moon passes between the Earth and the sun, blocking the sun's light. There are typically 2-5 solar eclipses per year. There are four types of solar eclipses: total, annular, partial, and hybrid. A total solar eclipse, where the moon completely blocks the sun's light, occurs on average every 18 months and can only be seen from a narrow path on Earth. The longest total solar eclipse of the 21st century occurred on July 22, 2009 and lasted over 6 minutes. Special care must be taken to safely observe a solar eclipse by using eclipse glasses or other filters to view the sun.
The document discusses different types of solar and lunar eclipses, including total, partial, and annular solar eclipses and penumbral, partial, and total lunar eclipses. It provides examples of quotes from historical accounts of eclipses dating back to 1375 BC and explanations of why the moon appears red during a lunar eclipse and the different parts of an eclipse shadow.
The document discusses lunar and solar eclipses. It explains that lunar eclipses occur when the Earth passes between the Sun and Moon, casting its shadow on the Moon. Solar eclipses occur when the Moon passes between the Earth and Sun, casting its shadow on parts of Earth. For an eclipse to occur, the Sun, Moon and Earth must be aligned on the same plane. The document provides details on the conditions required to view lunar and solar eclipses and why the Moon appears red during a lunar eclipse.
An eclipse occurs when one celestial body passes between the sun and another, blocking sunlight or moonlight. There are two main types of eclipses - lunar eclipses, where the moon passes into Earth's shadow, and solar eclipses, where the moon passes between Earth and the sun. During a lunar eclipse, the moon turns red as it is illuminated only by sunlight passing through Earth's atmosphere. A solar eclipse can be partial or total, where the moon completely blocks the sun's light over a small area. Total solar eclipses are rare as the moon's shadow is small and its orbit is tilted relative to Earth's.
There are two types of eclipses: lunar eclipses, which occur when the moon passes into Earth's shadow, and solar eclipses, which occur when the moon passes between Earth and the sun. Lunar eclipses can be total, partial, or penumbral depending on how far into Earth's shadow the moon passes. Solar eclipses can be total, partial, or annular depending on the moon's position in its orbit. Eclipses do not occur every month because the moon's orbit is tilted relative to Earth's orbit around the sun, so the three objects do not align perfectly except during eclipse seasons.
The document discusses lunar eclipses. It defines different types of lunar eclipses including penumbral, partial, and total eclipses. The next visible total lunar eclipse will occur on January 31, 2018 and will be seen in Asia, Australia, the Pacific Ocean, and western North America. During a lunar eclipse, the moon appears red due to Rayleigh scattering, which scatters blue light from the sun more than red light when it passes through the earth's atmosphere. For an eclipse to occur, the moon must pass within 11.38 degrees of the ecliptic plane at either its ascending or descending node where it intersects the ecliptic.
The document discusses eclipses of the sun and moon through various quotes and descriptions. It provides background on solar eclipses, noting that there are three types - annular, partial and total - and details like their frequency and visibility. It also covers lunar eclipses and explains why the moon appears red during an eclipse due to atmospheric filtering of light. Upcoming eclipses are listed, though none will be fully visible from the location.
An eclipse occurs when one celestial body passes between a source of light and another, blocking the light. There are two types of eclipses: solar eclipses, where the moon passes between the earth and sun, and lunar eclipses, where the earth passes between the moon and sun. The moon's shadow during a solar eclipse has two parts - the penumbra, where a partial eclipse can be seen, and the umbra, where a total eclipse occurs.
The document discusses eclipses and Jupiter's moon Ganymede. It begins by asking questions about the earth's movement and astronomical objects. It then defines shadow and discusses umbra and penumbra. It states that Jupiter has 64 moons, and its largest moon Ganymede is about 4.5 billion years old, similar in age to Jupiter. The document presents information on solar and lunar eclipses, noting that solar eclipses can be viewed safely using sunglasses to protect the eyes from the sun's light. It asks students to research and report on eclipses that have occurred in the Philippines.
The document summarizes the motions and phases of the Earth-Moon system. It explains that the moon orbits Earth over the course of about a month in an elliptical orbit, appearing larger when closer (perigee) and smaller when farther (apogee). The changing positions result in the phases of the moon as the illuminated side facing Earth waxes and wanes over the lunar cycle. Eclipses occur when the sun, Earth, and moon align, causing the moon to block the sun during a solar eclipse or Earth to block the sun's light during a lunar eclipse.
This document discusses different types of shadows formed during lunar and solar eclipses. A lunar eclipse occurs when the moon moves into Earth's shadow and is aligned with the sun and Earth. This can result in a blood moon that appears reddish. A solar eclipse happens when the moon is positioned between the Earth and sun, casting its shadow onto a portion of Earth. The document defines umbra, penumbra, and antumbra shadows and how they relate to complete or partial coverage of the moon or sun during different eclipse types. It also examines how the size of the light source and obstacle can impact shadow formation and characteristics.
The document discusses eclipses and Jupiter's moon Ganymede. It begins with an introduction to astronomical objects like planets and asteroids. It then discusses shadows and the terms umbra and penumbra in relation to eclipses. It notes that Jupiter has 64 moons, and that its largest moon Ganymede is around 4.5 billion years old, similar in age to Jupiter. The document includes questions about eclipses and safety tips for viewing a solar eclipse. It concludes with a short assignment to research and report on eclipses in the Philippines.
The document discusses solar eclipses, including their cultural significance, types of eclipses, and how to safely observe them. It provides details on total solar eclipses, explaining the geometry of the sun, earth and moon during an eclipse. It also describes a total solar eclipse observed in Turkey on March 29, 2006, noting the path of totality passed through various regions with over 4 minutes of totality in Antalya.
- Solar eclipses occur when the Moon passes between the Sun and Earth, casting its shadow on Earth's surface.
- Eclipses can be partial, total, or annular depending on the Moon's alignment with the Sun and Earth. A total solar eclipse can only be seen within the narrow path of the Moon's umbral shadow.
- While eclipses are now understood scientifically, many ancient cultures viewed solar eclipses as ominous events, believing they disrupted the natural order. Some people still react fearfully during an eclipse today.
The document provides information about the Sun and space weather. It discusses that the Sun is a dynamic star that is always changing and produces phenomena like sunspots, solar flares, and coronal mass ejections. When solar storms interact with Earth's magnetic field, they can produce effects like auroras and disrupt technology and power grids. Space agencies monitor the Sun to study space weather and its impacts on Earth.
This document provides information about the upcoming solar eclipse in the United States:
1. This will be the first total solar eclipse visible in the US in 38 years, with the last one only visible in parts of 5 northwestern states.
2. A solar eclipse occurs when the Moon passes between the Earth and the Sun, casting its shadow on Earth and blocking the Sun's light.
3. Interesting changes will be visible as the eclipse progresses, with shadows sharpening as the eclipse reaches totality.
A new filter for safe view of solar eclipseDr. siddhant
Looking directly at the sun can lead to permanent eye injury due to damage of light-sensitive rod and cone cells within the retina. There are two ways to look at the Sun safely: by observing the sun directly through a suitable filter, or by projecting the Sun’s reflection onto a piece of paper via handmade pinhole camera/ telescope. The present correspondence shows the specification for the development of an optical instrument for the direct observation of sun. For this device, commonly available solar control glass plates can be used. The design of this filter is based on the fact that both visible and UV radiation comply with the law of Reflection and Refraction of light. As light rays appeared on the glass plate, most of the rays pass through the glass after refraction. A portion of the incident ray is mirrored and goes out to the next glass panel, where the same thing is going to happen. Through this way, multiple glass plates reflect the light ray before diffuse light is received. Owing to the fact that diffuse reflection is responsible for the ability to see most illuminated objects, we will be able to see the dull image of sun directly through this filter during the solar eclipse.
An eclipse occurs when one heavenly body passes in front of another, blocking its light. There are two types of eclipses on Earth: solar and lunar. A solar eclipse happens when the moon passes between the earth and sun, casting its shadow on earth. A lunar eclipse occurs when the earth passes between the sun and moon, casting its shadow on the moon. Eclipses can be partial or total depending on how much of the sun or moon is blocked.
The document discusses the total lunar eclipse that will occur on the evening of September 27, 2015 in North America. It will be visible across much of the western hemisphere and last over an hour. The eclipse will have five stages as the Moon passes through Earth's penumbra and umbra shadows. Observers are encouraged to time the moments when the umbra's edge crosses different lunar features to help scientists study variations in the size of Earth's shadow.
This document discusses various optical phenomena that occur in Earth's atmosphere due to interactions between light and atmospheric particles. It explains that scattering of light by air molecules causes the blue color of the sky and red colors of sunrises and sunsets. Refraction of light is responsible for mirages and the apparent flattening of the sun near the horizon. Reflection and refraction in water droplets leads to rainbows. Various types of halos, sun dogs, and sun pillars are produced by light refraction and reflection in ice crystals in cirrus clouds.
This document discusses various optical phenomena that occur in Earth's atmosphere due to interactions between light and atmospheric particles. It explains that scattering of light by air molecules causes the blue color of the sky and red colors of sunrises and sunsets. Refraction of light is responsible for mirages and the apparent flattening of the sun near the horizon. Reflection and refraction in water droplets leads to rainbows. Other phenomena covered include halos, sun dogs, sun pillars, and twilight. The size and properties of scattering particles determine which colors of light are scattered more or less.
Nota: Este trabajo es original de parte de Andrés Mejía Valencia, que ha decidido compartirlo con todos los Amigos de nuestra Querida Sociedad Julio Garavito como una muestra de su Aprecio y Gratitud por la SJG
Esta presentación es de la primera parte de la charla sobre eclipses. Habla de generalidades y apuntes sobre algunos eclipses que tuve la oportunidad de observar.
There were several theories proposed to explain the origin of the Moon throughout history. The first was the fission theory from the 19th century, which suggested that the Moon formed when a chunk of Earth was pulled away by the Sun's gravity as Earth rapidly spun. Later theories included the capture theory, where the Moon was a wandering planet captured by Earth, and the coaccretion theory where the Moon and Earth formed together from the same material. Currently, the giant impact theory is favored, where a Mars-sized body collided with Earth, ejecting debris that coalesced to form the Moon. This theory best explains the compositional similarities and differences between Earth and the Moon.
1) The Earth, Sun and Moon exist in a complex system of orbits where the Moon revolves around the Earth and the Earth revolves around the Sun.
2) As the Moon orbits the Earth, the illuminated portion that we see from Earth changes in a cycle called phases, ranging from new moon to full moon and back over about two weeks.
3) Lunar and solar eclipses occur when the Moon passes between the Earth and Sun, casting its shadow on either the Moon or Earth, and can be total or partial depending on the alignment of the three bodies.
There are two types of eclipses: solar eclipses which occur when the moon passes between the earth and sun, and lunar eclipses which occur when the earth passes between the sun and moon. During a solar eclipse, the moon can block all, some, or none of the sun, resulting in total, partial, or annular eclipses. A total solar eclipse occurs when the moon completely covers the sun, briefly turning day to night, while partial eclipses only block part of the sun. Lunar eclipses occur during a full moon when the earth blocks the sun's light from reaching the moon, causing it to take on a red color from the sunlight bending through the earth's atmosphere.
The Human Eye and The Colourful World-PPT-4(10TH).pdfIphanyiJoseph
1. Atmospheric refraction causes the twinkling of stars. As starlight enters Earth's atmosphere, it is refracted through a medium with a gradually changing refractive index, causing the star's apparent position to fluctuate slightly.
2. Since stars appear as point sources of light from Earth, the slight variations in the path of incoming starlight results in fluctuations in the amount of starlight reaching the eye, causing stars to appear to twinkle.
3. Planets do not twinkle because, being closer to Earth, they are seen as extended sources rather than point sources - light variations from different parts average out, nullifying the twinkling effect.
The document provides information about the sun, including:
- The sun is a star that is the center of our solar system and provides light, heat, and energy for life on Earth.
- Ancient civilizations worshipped the sun as a god due to its importance.
- The sun is powered by nuclear fusion in its core and has a diameter of over 432,000 miles.
- Other topics covered include the sun's luminosity, solar constant, astronomical units, structure including the photosphere and chromosphere, sunspots, solar cycle, solar wind, and more.
The document describes the different types of solar and lunar eclipses. A solar eclipse occurs when the moon passes between the earth and sun, casting its shadow on parts of the earth. There are two parts to the moon's shadow, the inner dark umbra and outer lighter penumbra. During an annular eclipse, the moon is too small to completely cover the sun, leaving a bright ring visible. The document also explains that a lunar eclipse occurs when the moon moves into the earth's shadow, and can only happen during a full moon. It warns never to look directly at the sun without proper eye protection to avoid eye damage, especially during partial phases of a solar eclipse.
The document discusses solar and lunar eclipses. It explains that a solar eclipse occurs when the moon passes between the Earth and the sun, casting its shadow on parts of Earth. A lunar eclipse happens when Earth passes between the sun and moon, casting its shadow on the moon. There are three types of solar eclipses: partial, annular, and total, depending on the alignment of the sun, moon, and Earth. During a solar or lunar eclipse, the moon's shadow on Earth or Earth's shadow on the moon can include the umbra, antumbra, or penumbra regions.
Microbial interaction
Microorganisms interacts with each other and can be physically associated with another organisms in a variety of ways.
One organism can be located on the surface of another organism as an ectobiont or located within another organism as endobiont.
Microbial interaction may be positive such as mutualism, proto-cooperation, commensalism or may be negative such as parasitism, predation or competition
Types of microbial interaction
Positive interaction: mutualism, proto-cooperation, commensalism
Negative interaction: Ammensalism (antagonism), parasitism, predation, competition
I. Mutualism:
It is defined as the relationship in which each organism in interaction gets benefits from association. It is an obligatory relationship in which mutualist and host are metabolically dependent on each other.
Mutualistic relationship is very specific where one member of association cannot be replaced by another species.
Mutualism require close physical contact between interacting organisms.
Relationship of mutualism allows organisms to exist in habitat that could not occupied by either species alone.
Mutualistic relationship between organisms allows them to act as a single organism.
Examples of mutualism:
i. Lichens:
Lichens are excellent example of mutualism.
They are the association of specific fungi and certain genus of algae. In lichen, fungal partner is called mycobiont and algal partner is called
II. Syntrophism:
It is an association in which the growth of one organism either depends on or improved by the substrate provided by another organism.
In syntrophism both organism in association gets benefits.
Compound A
Utilized by population 1
Compound B
Utilized by population 2
Compound C
utilized by both Population 1+2
Products
In this theoretical example of syntrophism, population 1 is able to utilize and metabolize compound A, forming compound B but cannot metabolize beyond compound B without co-operation of population 2. Population 2is unable to utilize compound A but it can metabolize compound B forming compound C. Then both population 1 and 2 are able to carry out metabolic reaction which leads to formation of end product that neither population could produce alone.
Examples of syntrophism:
i. Methanogenic ecosystem in sludge digester
Methane produced by methanogenic bacteria depends upon interspecies hydrogen transfer by other fermentative bacteria.
Anaerobic fermentative bacteria generate CO2 and H2 utilizing carbohydrates which is then utilized by methanogenic bacteria (Methanobacter) to produce methane.
ii. Lactobacillus arobinosus and Enterococcus faecalis:
In the minimal media, Lactobacillus arobinosus and Enterococcus faecalis are able to grow together but not alone.
The synergistic relationship between E. faecalis and L. arobinosus occurs in which E. faecalis require folic acid
Describing and Interpreting an Immersive Learning Case with the Immersion Cub...Leonel Morgado
Current descriptions of immersive learning cases are often difficult or impossible to compare. This is due to a myriad of different options on what details to include, which aspects are relevant, and on the descriptive approaches employed. Also, these aspects often combine very specific details with more general guidelines or indicate intents and rationales without clarifying their implementation. In this paper we provide a method to describe immersive learning cases that is structured to enable comparisons, yet flexible enough to allow researchers and practitioners to decide which aspects to include. This method leverages a taxonomy that classifies educational aspects at three levels (uses, practices, and strategies) and then utilizes two frameworks, the Immersive Learning Brain and the Immersion Cube, to enable a structured description and interpretation of immersive learning cases. The method is then demonstrated on a published immersive learning case on training for wind turbine maintenance using virtual reality. Applying the method results in a structured artifact, the Immersive Learning Case Sheet, that tags the case with its proximal uses, practices, and strategies, and refines the free text case description to ensure that matching details are included. This contribution is thus a case description method in support of future comparative research of immersive learning cases. We then discuss how the resulting description and interpretation can be leveraged to change immersion learning cases, by enriching them (considering low-effort changes or additions) or innovating (exploring more challenging avenues of transformation). The method holds significant promise to support better-grounded research in immersive learning.
The debris of the ‘last major merger’ is dynamically youngSérgio Sacani
The Milky Way’s (MW) inner stellar halo contains an [Fe/H]-rich component with highly eccentric orbits, often referred to as the
‘last major merger.’ Hypotheses for the origin of this component include Gaia-Sausage/Enceladus (GSE), where the progenitor
collided with the MW proto-disc 8–11 Gyr ago, and the Virgo Radial Merger (VRM), where the progenitor collided with the
MW disc within the last 3 Gyr. These two scenarios make different predictions about observable structure in local phase space,
because the morphology of debris depends on how long it has had to phase mix. The recently identified phase-space folds in Gaia
DR3 have positive caustic velocities, making them fundamentally different than the phase-mixed chevrons found in simulations
at late times. Roughly 20 per cent of the stars in the prograde local stellar halo are associated with the observed caustics. Based
on a simple phase-mixing model, the observed number of caustics are consistent with a merger that occurred 1–2 Gyr ago.
We also compare the observed phase-space distribution to FIRE-2 Latte simulations of GSE-like mergers, using a quantitative
measurement of phase mixing (2D causticality). The observed local phase-space distribution best matches the simulated data
1–2 Gyr after collision, and certainly not later than 3 Gyr. This is further evidence that the progenitor of the ‘last major merger’
did not collide with the MW proto-disc at early times, as is thought for the GSE, but instead collided with the MW disc within
the last few Gyr, consistent with the body of work surrounding the VRM.
When I was asked to give a companion lecture in support of ‘The Philosophy of Science’ (https://shorturl.at/4pUXz) I decided not to walk through the detail of the many methodologies in order of use. Instead, I chose to employ a long standing, and ongoing, scientific development as an exemplar. And so, I chose the ever evolving story of Thermodynamics as a scientific investigation at its best.
Conducted over a period of >200 years, Thermodynamics R&D, and application, benefitted from the highest levels of professionalism, collaboration, and technical thoroughness. New layers of application, methodology, and practice were made possible by the progressive advance of technology. In turn, this has seen measurement and modelling accuracy continually improved at a micro and macro level.
Perhaps most importantly, Thermodynamics rapidly became a primary tool in the advance of applied science/engineering/technology, spanning micro-tech, to aerospace and cosmology. I can think of no better a story to illustrate the breadth of scientific methodologies and applications at their best.
The cost of acquiring information by natural selectionCarl Bergstrom
This is a short talk that I gave at the Banff International Research Station workshop on Modeling and Theory in Population Biology. The idea is to try to understand how the burden of natural selection relates to the amount of information that selection puts into the genome.
It's based on the first part of this research paper:
The cost of information acquisition by natural selection
Ryan Seamus McGee, Olivia Kosterlitz, Artem Kaznatcheev, Benjamin Kerr, Carl T. Bergstrom
bioRxiv 2022.07.02.498577; doi: https://doi.org/10.1101/2022.07.02.498577
Mending Clothing to Support Sustainable Fashion_CIMaR 2024.pdfSelcen Ozturkcan
Ozturkcan, S., Berndt, A., & Angelakis, A. (2024). Mending clothing to support sustainable fashion. Presented at the 31st Annual Conference by the Consortium for International Marketing Research (CIMaR), 10-13 Jun 2024, University of Gävle, Sweden.
PPT on Direct Seeded Rice presented at the three-day 'Training and Validation Workshop on Modules of Climate Smart Agriculture (CSA) Technologies in South Asia' workshop on April 22, 2024.
Anti-Universe And Emergent Gravity and the Dark UniverseSérgio Sacani
Recent theoretical progress indicates that spacetime and gravity emerge together from the entanglement structure of an underlying microscopic theory. These ideas are best understood in Anti-de Sitter space, where they rely on the area law for entanglement entropy. The extension to de Sitter space requires taking into account the entropy and temperature associated with the cosmological horizon. Using insights from string theory, black hole physics and quantum information theory we argue that the positive dark energy leads to a thermal volume law contribution to the entropy that overtakes the area law precisely at the cosmological horizon. Due to the competition between area and volume law entanglement the microscopic de Sitter states do not thermalise at sub-Hubble scales: they exhibit memory effects in the form of an entropy displacement caused by matter. The emergent laws of gravity contain an additional ‘dark’ gravitational force describing the ‘elastic’ response due to the entropy displacement. We derive an estimate of the strength of this extra force in terms of the baryonic mass, Newton’s constant and the Hubble acceleration scale a0 = cH0, and provide evidence for the fact that this additional ‘dark gravity force’ explains the observed phenomena in galaxies and clusters currently attributed to dark matter.
Evidence of Jet Activity from the Secondary Black Hole in the OJ 287 Binary S...Sérgio Sacani
Wereport the study of a huge optical intraday flare on 2021 November 12 at 2 a.m. UT in the blazar OJ287. In the binary black hole model, it is associated with an impact of the secondary black hole on the accretion disk of the primary. Our multifrequency observing campaign was set up to search for such a signature of the impact based on a prediction made 8 yr earlier. The first I-band results of the flare have already been reported by Kishore et al. (2024). Here we combine these data with our monitoring in the R-band. There is a big change in the R–I spectral index by 1.0 ±0.1 between the normal background and the flare, suggesting a new component of radiation. The polarization variation during the rise of the flare suggests the same. The limits on the source size place it most reasonably in the jet of the secondary BH. We then ask why we have not seen this phenomenon before. We show that OJ287 was never before observed with sufficient sensitivity on the night when the flare should have happened according to the binary model. We also study the probability that this flare is just an oversized example of intraday variability using the Krakow data set of intense monitoring between 2015 and 2023. We find that the occurrence of a flare of this size and rapidity is unlikely. In machine-readable Tables 1 and 2, we give the full orbit-linked historical light curve of OJ287 as well as the dense monitoring sample of Krakow.
2. Dave Hearn
Involved in Amateur Astronomy
for over 40 years
Astrophotographer
Astronomy Outreach Evangelist
Astronomy Book Author
2
3. Kissimmee Park Observatory
Private Observatory in Central Florida
Saint Cloud; 25 miles south of
Orlando, FL
Primary activities are
Astrophotography and Astronomy
Outreach
Began public operation in January
2013
KPObservatory.org
Facebook.com/kpobservatory
3
4. Star Hopping
Weekly astronomy show on YouTube that
teaches you how to locate beautiful targets
in the night sky.
StarHopping.org
Google “Star Hopping” and select ‘Videos”
Nearly 60 Episodes, started in October,
2015
Over 1300 subscribers on YouTube and
Facebook
4
9. What Causes an Eclipse?
An eclipse occurs when one celestial body moves in
front of another, temporarily blocking it from view
from a particular vantage point.
Nerd Alert: This alignment is called a “Syzygy”.
Two Eclipse Seasons per year, lasting between 30
and 38 days each – based on alignments of Earth’s
path around the Sun and the Moon’s orbit around
Earth.
9
10. Types of Eclipses
Lunar Eclipse – The Earth moves
between the Sun and the Moon
Solar Eclipse – The Moon moves
between the Earth and the Sun
10
11. Lunar Eclipses
Lunar Eclipses occur more frequently – the Earth’s shadow is large
Occurs at the point of the Full Moon phase.
Darkest part of Earth’s shadow is called the Umbra
Outside part of the shadow is called the Penumbra
Deep eclipses (into the Umbra) cause “Blood Moon” lunar eclipses
11
12. Solar Eclipses
Much more rare than Lunar Eclipses
because the Moon’s shadow is so small.
Occurs at the point of the New Moon phase.
If the observer is outside the central cone
(“Umbra”) of the Moon’s shadow, they see a
partial eclipse.
From inside the Umbra the observer sees a
Total Solar Eclipse.
Total Solar Eclipses last for a maximum of 7
minutes and 29 seconds – July 16, 2186.
12
13. Partial Solar Eclipse
Partial Solar Eclipses are seen when the
observer is within the Moon’s outer
shadow, or “Penumbra”.
No major effects are seen until the partial
phase approaches 98%.
Pinhole Effects can be seen if you know
to look for them.
Solar Filters MUST be used to observe a
Partial Solar Eclipse.
13
14. Annular Solar Eclipse
An Annular Eclipse is also known as a “Ring of
Fire” Eclipse.
Name comes from the Latin word “Annulus” which
means “Ring”.
This is essentially a Total Eclipse, except the
distance of the Moon from the Earth is great
enough to not permit the Umbra to reach the
Earth.
Solar Filters MUST be used to observe an
Annular Solar Eclipse.
14
15. Total Solar Eclipse
A Total Solar Eclipse is most probably the greatest
celestial show that can be seen with the Naked
Eye.
When the Moon’s disk is perfectly aligned with the
Solar Disk, the bright photosphere is hidden, which
allows the beautiful and wispy corona to be seen.
This event is also known as “Totality”.
The Solar Corona has about the same brightness
as the Full Moon.
Solar Filters are not required (and cannot be used)
during Totality. This is the ONLY time you can view
the Sun with your naked eye.
15
16. Eclipse Safety
A Total Solar Eclipse creates a fairly dangerous
situation, as people tend to want to use binoculars or
telescopes to view the event.
Optical devices collect and magnify light – the intense
light from the sun is focused to what is essentially a
laser beam.
If this focused light hits your retina it will painlessly burn
it (no nerve endings in the retina), which will impact
your sight.
Solar Filters MUST be used. Safe solar filters fit over
the FRONT of a telescope of binoculars.
16
17. Solar Filters
New mylar film solar filters are fitted
on the FRONT of a telescope or
binoculars. This type of filter blocks all
the heat and 99.999% of the light,
allowing you to safely view the
pleasant yellow disc of the sun.
Other forms of filtering, such as
welder’s glass, smoked glass, or
window tinting film are NOT safe.
17
18. Eclipse Glasses
Solar Eclipse Glasses have similar
film, and can be worn as normal
sunglasses to let you view the
partial phases of the eclipse with
your own eyes.
Normal Sunglasses are NOT safe.
18
19. What Can You Expect to See?
Many interesting and unusual effects
accompany a Total Solar Eclipse:
Approaching Lunar Shadow
Pinhole Camera Effects
Shadow Bands (rare)
Baily’s Beads
Diamond Ring
Solar Corona
19
20. Approaching Lunar Shadow
From a high vantage point, it is possible to see the
approaching lunar shadow.
The shadow will be moving across the landscape at
approximately 1500 miles per hour.
From the summit of Brasstown Bald, the shadow will be
seen approaching from the Northwest, approximately 5
minutes before Totality begins.
When the shadow reaches the observer, Totality begins.
The shadow can be seen racing away to the southeast
after Totality ends.
Excellent to capture via a time lapse movie.
20
21. Pinhole Camera Effects
A “Pinhole Camera” is created by any small hole: it
projects an image of the Sun on the ground. The gaps
between leaves of trees create one of the most
common instances of Pinhole Camera effects.
Normally the image of the Sun is round. However in the
deep partial eclipse phases, the images that are
projected are crescents.
These images can be photographed with your basic
camera or phone, and serve as a nice memento of the
event.
21
22. Shadow Bands
Shadow Bands are a very rare effect that can be seen in the
last few moments before Totality.
On any blank white surface, it is possible to see wavy,
undulating lines.
Shadow Bands are caused by the small solar surface and
atmospheric “boiling”. This is the same effect that causes
stars to twinkle.
As the partial phase of the eclipse progresses, shadows will
become more distinct and very sharp.
This is something that is easily missed because of the
impending drama of the approaching Totality.
22
23. Baily’s Beads
The appearance of Baily’s beads
heralds the beginning and the end of
Totality.
Caused by the Sun’s photosphere
shining though craters on the limb of the
Moon.
Occurs at 2nd Contact and 3rd Contact.
23
24. Diamond Ring Effect
Appearance of the first Diamond
Ring raises the excitement level!
At 2nd Contact, the last Baily’s
Bead creates the Diamond Ring
At 3rd Contact the first Baily’s Bead
again creates the Diamond Ring
24
25. Diamond Ring Effect
Dangerous period of time – this is the
last / first blast of light from the blinding
Solar Photosphere.
At 2nd contact, this is when you will take
off your Eclipse Glasses and remove
filters from lenses and telescopes. Be
careful here!
At 3rd contact, this is when you will put
your filters and eclipse glasses back on.
25
26. Totality and the Solar Corona
Totality is why we go to the
Centerline!
Nature’s most amazing spectacle.
Daylight quickly reduces to deep twilight
Temperature drops 10-15 degrees
Birds go in to roost, night time insects start
singing
Sunset colors extend 360 degrees around all
horizons
26
27. Totality and the Solar Corona
Totality can last a maximum of 7 minutes
and 29 seconds.
But not for us this time – only 2:13.
Only during Totality can we see the faint
Solar Corona
The Corona extends millions of miles into
space
About as bright as the Full Moon
Solar Filters and Eclipse glasses MUST be
removed to see the Corona
27
28. Eclipse Events on August 21st, 2017
First Contact
Second Contact
Maximum Eclipse
Third Contact
Fourth Contact
28
29. First Contact: 1:06:03 PM
The point in time when the Moon’s
limb visually contacts the Sun’s
limb.
Technically the beginning of the
entire eclipse event.
At Brasstown Bald, First Contact
will occur at 1:06:03 PM.
29
30. Second Contact: 2:35:09 PM
The point when the entire lunar disk
fits within the solar disk.
Technically the start of Totality.
At this point you must take off your
eclipse glasses to be able to see
the solar corona.
30
31. Second Contact: 2:35:09 PM
Heralded by Baily’s Beads and the
first Diamond Ring effect.
Daylight recedes into twilight.
At Brasstown Bald, Second Contact
will occur at 2:35:09 PM.
Totality at Brasstown Bald will last 2
minutes and 13 seconds.
31
32. Maximum Eclipse: 2:36:15 PM
The point in time when the Moon’s disk is
centered on the Sun’s disk.
Technically Mid-Eclipse. It’s half over!
At this point the greatest extent of the Solar
Corona can be seen.
This is also the greatest extent of the darkness
cause by the Moon’s Shadow.
At Brasstown Bald, Maximum Eclipse will occur
at 2:36:15 PM.
32
33. Third Contact: 2:37:22 PM
The point in time when the Moon’s disk
contacts the opposite side of the Sun’s disk.
Technically the end of Totality. So Sad!
Heralded by the second Diamond Ring effect,
and another appearance of Baily’s beads.
Time to put your eclipse glasses back on.
Daylight returns.
At Brasstown Bald, Third Contact will occur at
2:37:22 PM.
33
34. Fourth Contact: 4:00:49 PM
The point in time when the Moon’s disk leaves
the Sun’s disk.
The end of the partial phases, and the
technical end of the eclipse.
Time to pack up your gear and go home!
At Brasstown Bald, Fourth Contact will occur at
4:00:49 PM
Hang out and enjoy the beautiful views while
the rest of the crowd tries to leave all at once.
(many will leave after Third Contact)
34
35. Eclipse Photography
As with any beautiful celestial event, people will want to
capture the spectacular views during Totality.
Much planning is required; everything needs to work perfectly
because Nature allows no Instant Replays.
Not a time to try out a new lens or new equipment. You need
to be intimately familiar with any equipment you will use.
Maybe better to just enjoy the event through your trusty
Eclipse Glasses. Um, Not!
35
36. Super Telephotos & Telescopes
Super Telephotos range from
200mm to 2000mm focal length
Allows you to capture about 3
solar diameters – will fit the entire
solar disk and the corona
Telescopes will allow closer views
to see sunspots and closeups of
the partial eclipse phases
36
37. Super Telephotos & Telescopes
MUST be fitted with a solar filter on
FRONT of the telescope or lens
You need to be ready to remove the
filters before 2nd contact and replace
them after 3rd contact
Must use a motorized telescope
mount or tracking platform because
of the higher magnification
37
38. Time Lapse Movies
Excellent to document the motion of the Moon’s shadow, the
appearance of all of the eclipse effects, and motion of the
clouds and crowd.
Camera needs to be placed on a stationary tripod.
Intervalometer is needed to automate the repeating exposures
Series of images need to be combined into a movie
Number of frames and frame rate will determine the length of
the finished movie.
See StarHopping.org/SH048 for an online tutorial on Time
Lapse astrophotography.
38
39. Pinhole Effect Shots
Opportunity to capture this effect will come
during the partial phases between 50% and
75% of solar coverage
Create boards with lettering and holes drilled to
create a bunch of tiny crescents on the ground
Take pictures of friends and family with pinhole
crescents on their faces or clothing
Will have two opportunities before and after
Totality.
39
40. Real Time Movies
Will be the most popular capture during the eclipse
Movies will flood the Internet after the event.
Social media will have nothing but eclipse movies.
In locations with good Internet coverage, live
streaming will be very popular
Will it crash the Internet???
40
41. Dave’s Eclipse Kit
Two DSLRs mounted on an
iOptron Smart EQ robotic
equatorial mount.
Canon 6D mounted to a
1000mm Orion Maksutov mirror
lens for closeups of the corona
and partial phases
41
42. Dave’s Eclipse Kit
Two DSLRs mounted on an
iOptron Smart EQ robotic
equatorial mount.
Canon 60D mounted to a Canon
100-400mm “L” zoom lens.
Effectively 640mm. Will use for
wider field views to capture
outer corona.
42
43. Dave’s Eclipse Kit
Solar Eclipse Maestro
software running on my
MacBook Pro
Canon 6D with an Alpine
Radian panning time lapse
mount
Canon 100D used as a mobile
video camera
43
44. Eclipse Resources
GreatAmericanEclipse.com – Michael Zeiler
Eclipsophile.com – (eclipse weather) Jay Anderson
Eclipse2017.org – (local predictions) Javier Zubier
EclipseWise.com – Fred Espenak
Eclipse-Maps.com – Michael Zeiler
StarHopping.org / SH054 – Planning for the Great
American Eclipse
StarHopping.org / SH057 – Photographing the
Great American Solar Eclipse
44
45. A Year of Star Hopping
New Book being released on Amazon,
iTunes Store, and StarHopping.org
340 pages – 8.5” x 11” paperback bound
/ eBook
Shows how to locate over 100 deep sky
objects using my “Star Hopping” method.
Based on a year of episodes of my Star
Hopping YouTube show.
45
Hey Hello Hi, and welcome to the Great American Solar Eclipse version of Star Hopping.
Star Hopping is my weekly astronomy show on YouTube.
Welcome people on Facebook Live.
Talk up book launch a little – next week on Wednesday August 30th.
Amazing that the heavens decided to have a total solar eclipse right before my book launch – wonderful coincidence!
Public Observing sessions each month as weather permits.
Astrophotography on the website.
Transition:
So I’m going to take you on a little side trip here before we get to the main event.
I want to try to adjust your perspective on tomorrow’s amazing event.
Time & Distance.
So I deal with Stars on a weekly basis in Star Hopping.
Discuss the Star Hopping process – end up on a deep sky target.
Here’s an example of a deep sky object that we can find in the night sky; the Andromeda Galaxy.
This galaxy holds a trillion stars and lies 2.5 million light years away.
Light has been traveling for 2 ½ Million years.
Our galaxy is similar except we live inside it.
All the stars you see throughout this picture are in OUR galaxy, the Milky Way.
Every one of these dots are stars.
There are more stars in the night sky than there are grains of sand on every beach on Earth.
Think about our own little neighborhood in our galaxy. What’s the closest star?
Proxima Centauri - 3.4 light years away. Light takes 3.4 years. But there is a much closer star…
The Sun is our local star – 93 million miles away. 8 light minutes.
We live on a small rocky planet orbiting that star.
Our single natural satellite that is orbiting around us is going to move just right to eclipse that star.
“Solar” based on “Sol”. It’s a total stellar eclipse.
Show of hands
How many have seen an eclipse?
How many have seen a lunar eclipse?
How many have seen a solar eclipse?
Lunar eclipses occur at Full Moon.
Solar eclipses occur on New Moon.
These occur two weeks apart every month.
So why don’t we have eclipses every two weeks?
Moon’s orbit is inclined 5 degrees from the plane of the Earth’s orbit around the sun. so most of the time the shadow misses.
Last one was April 14, 2014 – this image.
Moon’s Shadow this time is only about 70 miles wide.
Our total solar eclipse includes partial phases, so you need to wear your eclipse glasses, except during totality.
In this case only the Lunar penumbra (fainter outer shadow) reaches the Earth.
This is why we are all here in the Moon’s Shadow.
I have been using the Full Moon to estimate my exposure times for Totality.
Totality at Brasstown Bald is 2 Minutes 13 seconds.
We as Astronomy educators have been careful this time around to not scare people into not viewing the eclipse.
During the 1979 total eclipse, (northwest US) some schools did not permit the students to go outside; even pulling down window shades. That’s a crime!
This time we are gently educating people about using their eclipse glasses and greatly encouraging everyone, especially children, to experience the event.
The danger is not so much to the naked eye, but in using optical aid. If you look at the bright mid-day sun, you will instinctively look away because it’s too bright.
But using eclipse glasses lets you comfortably gaze at the sun safely.
If you didn't get your eclipse glasses, or have misplaced them, I have a small quantity - catch me after the talk.
Rumors of non-approved eclipse glasses have been coming out over the last month.
Now let’s look at each one of these.
Also known as a “camera obscura” effect.
Difficult to find pictures of this phenomenon.
Solar Eclipse Maestro does excellent simulations of this phenomenon.
2:13 at Brasstown Bald.
2:39 in Andrews.
These five events occur for any eclipse, lunar or solar.
Example:
Images taken every 15 seconds for 3 Hours – 4 pix per minute * 180 minutes in 3 hours = 720 frames
Frames put into a movie @ 15 frames per second – 720 frames / 15 fps = movie lasting 48 seconds.
After 75% you need to prepare for Totality.
Canon 60D is a crop frame camera which yields an inherent 1.6X multiplication factor, which will yield the 640mm focal length.
$24.95 Paperback (advance copies available here)
$17.95 eBook