Solar_and_Lunar_Eclipses1.ppt
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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 daily because the moon's orbit is tilted relative to Earth's orbit around the sun, so the three bodies do not align perfectly most months.
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Solar and lunar_eclipses1
The document discusses lunar and solar eclipses. It explains that a lunar eclipse occurs when the Earth passes between the Sun and Moon, casting its shadow on the Moon. A solar eclipse happens when the Moon passes between the Earth and Sun, casting its shadow on parts of Earth. There are three types of each: total, partial, and penumbral/annular. Eclipses do not occur daily because the Moon's orbit is tilted relative to Earth's orbit around the Sun, but there are seasons when eclipses are more likely to occur.
Eclipses by WSTA412
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.
Final PPT_eclipse.ppt
An eclipse occurs when one celestial body passes in front of another and casts a shadow. A solar eclipse happens when the moon passes between the earth and sun, casting its shadow on earth. There are three types of solar eclipses: total, partial, and annular. A total solar eclipse can only be seen within the moon's dark umbral shadow. A lunar eclipse occurs when the earth passes between the sun and moon, casting its shadow on the moon. The three types of lunar eclipses are: total, partial, and penumbral. Eclipses can only occur during a new moon for a solar eclipse or full moon for a lunar eclipse.
Eclipses
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.
An astronomical event that occurs when one celestial object (Earth or moon) m...
An astronomical event that occurs when one celestial object (Earth or moon) m...SILVINOHERNANDEZREYE
Solar and lunar eclipses occur when one celestial body passes into the shadow of another. There are two types of eclipses: (1) Solar eclipses happen when the moon passes between the earth and sun, casting its shadow on part of the earth. (2) Lunar eclipses occur when the earth passes between the sun and moon, casting its shadow on the moon. The document discusses the different types of solar and lunar eclipses as well as why we do not see an eclipse every month.Solar and Lunar eclipse
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.
Solar Eclipse
The solar eclipse occurs when the moon passes between the Earth and the sun, blocking all or part of the sun's light. There are four types of solar eclipses - total, partial, annular, and hybrid. A total solar eclipse can only be seen from within the moon's umbral shadow, while a partial solar eclipse can be seen within the penumbral shadow. The moon's orbit is tilted relative to Earth's, so solar eclipses do not occur every month. The most recent solar eclipse was an annular eclipse visible from parts of Asia and Africa on June 21, 2020.
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Solar and lunar_eclipses1
The document discusses lunar and solar eclipses. It explains that a lunar eclipse occurs when the Earth passes between the Sun and Moon, casting its shadow on the Moon. A solar eclipse happens when the Moon passes between the Earth and Sun, casting its shadow on parts of Earth. There are three types of each: total, partial, and penumbral/annular. Eclipses do not occur daily because the Moon's orbit is tilted relative to Earth's orbit around the Sun, but there are seasons when eclipses are more likely to occur.
Eclipses by WSTA412
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.
Final PPT_eclipse.ppt
An eclipse occurs when one celestial body passes in front of another and casts a shadow. A solar eclipse happens when the moon passes between the earth and sun, casting its shadow on earth. There are three types of solar eclipses: total, partial, and annular. A total solar eclipse can only be seen within the moon's dark umbral shadow. A lunar eclipse occurs when the earth passes between the sun and moon, casting its shadow on the moon. The three types of lunar eclipses are: total, partial, and penumbral. Eclipses can only occur during a new moon for a solar eclipse or full moon for a lunar eclipse.
Eclipses
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.
An astronomical event that occurs when one celestial object (Earth or moon) m...
An astronomical event that occurs when one celestial object (Earth or moon) m...SILVINOHERNANDEZREYE
Solar and lunar eclipses occur when one celestial body passes into the shadow of another. There are two types of eclipses: (1) Solar eclipses happen when the moon passes between the earth and sun, casting its shadow on part of the earth. (2) Lunar eclipses occur when the earth passes between the sun and moon, casting its shadow on the moon. The document discusses the different types of solar and lunar eclipses as well as why we do not see an eclipse every month.Solar and Lunar eclipse
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.
Solar Eclipse
The solar eclipse occurs when the moon passes between the Earth and the sun, blocking all or part of the sun's light. There are four types of solar eclipses - total, partial, annular, and hybrid. A total solar eclipse can only be seen from within the moon's umbral shadow, while a partial solar eclipse can be seen within the penumbral shadow. The moon's orbit is tilted relative to Earth's, so solar eclipses do not occur every month. The most recent solar eclipse was an annular eclipse visible from parts of Asia and Africa on June 21, 2020.
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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.
The basics of solar eclipse
An eclipse occurs when one celestial body passes in front of another, blocking its light. A solar eclipse happens when the moon passes between Earth and the sun, casting its shadow on Earth. There are several types of solar eclipses depending on how much of the sun is obscured by the moon, including total, annular, partial, and hybrid eclipses. The moon's shadow during an eclipse consists of the umbra, penumbra, and antumbra regions. Historical beliefs about eclipses included that they were caused by evil spirits or were omens of tragedy.
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- 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.
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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.
Sp11 -notes--moon and eclipses
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.
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Gathered from many sources of Slideshare users, some of the pictures are not ours, we give credits to the owners. Our purpose of creating this slideshare are to pass our project and to inform others as well.
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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.
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.
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The document discusses different types of eclipses including solar and lunar eclipses. A solar eclipse occurs when the moon passes between the earth and sun, blocking the sun from view. A lunar eclipse occurs when the earth passes between the sun and moon, casting the moon in earth's shadow. The document provides details on the different types of solar and lunar eclipses as well as explanations for why eclipses do not occur every month and why the moon appears red during a lunar eclipse.
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Eclips es 2010 rvf
Eclipses occur when one celestial body blocks the sunlight from reaching another. A solar eclipse happens during a new moon when the moon passes between the earth and sun, casting its shadow on earth. A lunar eclipse occurs during a full moon when the earth blocks the sunlight from reaching the moon, casting its shadow on the moon. Eclipses only occur when the sun, moon, and earth are precisely aligned in a straight line, which does not happen every month due to the tilt of the moon's orbit.
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1. Tides are caused by the gravitational pull of the Moon and Sun on the Earth's oceans, with approximately two high tides and two low tides every 48 hours.
2. Spring tides occur at New and Full Moons, producing very high high tides and low low tides, while neap tides at First and Last Quarters have lower tides.
3. Solar eclipses occur during New Moons when the Moon passes between the Earth and Sun, while lunar eclipses happen at Full Moons as the Moon passes through the Earth's shadow.
Think Science: What Are Eclipses (101), by Craig Bobchin
Craig Bobchin, of Astronomy4You, prepared this presentation for Texas Public Radio's Think Science event on April 8, 2024.
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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.
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Gathered from many sources of Slideshare users, some of the pictures are not ours, we give credits to the owners. Our purpose of creating this slideshare are to pass our project and to inform others as well.
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Eclipses occur when one celestial body blocks the sunlight from reaching another. A solar eclipse happens during a new moon when the moon passes between the earth and sun, casting its shadow on earth. A lunar eclipse occurs during a full moon when the earth blocks the sunlight from reaching the moon, casting its shadow on the moon. Eclipses only occur when the sun, moon, and earth are precisely aligned in a straight line, which does not happen every month due to the tilt of the moon's orbit.
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3. Solar eclipses occur during New Moons when the Moon passes between the Earth and Sun, while lunar eclipses happen at Full Moons as the Moon passes through the Earth's shadow.
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Methods. The project is based primarily on recent observations conducted with the Chandra and JWST observatories. Specifically,
the Chandra survey of Westerlund 1 consists of 36 new ACIS-I observations, nearly co-pointed, for a total exposure time of 1 Msec.
Additionally, we included 8 archival Chandra/ACIS-S observations. This paper presents the resulting catalog of X-ray sources within
and around Westerlund 1. Sources were detected by combining various existing methods, and photon extraction and source validation
were carried out using the ACIS-Extract software.
Results. The EWOCS X-ray catalog comprises 5963 validated sources out of the 9420 initially provided to ACIS-Extract, reaching a
photon flux threshold of approximately 2 × 10−8 photons cm−2
s
−1
. The X-ray sources exhibit a highly concentrated spatial distribution,
with 1075 sources located within the central 1 arcmin. We have successfully detected X-ray emissions from 126 out of the 166 known
massive stars of the cluster, and we have collected over 71 000 photons from the magnetar CXO J164710.20-455217.
11.1 Role of physical biological in deterioration of grains.pdf
Storagedeteriorationisanyformoflossinquantityandqualityofbio-materials.
Themajorcausesofdeteriorationinstorage
•Physical
•Biological
•Mechanical
•Chemical
Storageonlypreservesquality.Itneverimprovesquality.
Itisadvisabletostartstoragewithqualityfoodproduct.Productwithinitialpoorqualityquicklydepreciates
ESR spectroscopy in liquid food and beverages.pptx
With increasing population, people need to rely on packaged food stuffs. Packaging of food materials requires the preservation of food. There are various methods for the treatment of food to preserve them and irradiation treatment of food is one of them. It is the most common and the most harmless method for the food preservation as it does not alter the necessary micronutrients of food materials. Although irradiated food doesn’t cause any harm to the human health but still the quality assessment of food is required to provide consumers with necessary information about the food. ESR spectroscopy is the most sophisticated way to investigate the quality of the food and the free radicals induced during the processing of the food. ESR spin trapping technique is useful for the detection of highly unstable radicals in the food. The antioxidant capability of liquid food and beverages in mainly performed by spin trapping technique.
Immersive Learning That Works: Research Grounding and Paths Forward
We will metaverse into the essence of immersive learning, into its three dimensions and conceptual models. This approach encompasses elements from teaching methodologies to social involvement, through organizational concerns and technologies. Challenging the perception of learning as knowledge transfer, we introduce a 'Uses, Practices & Strategies' model operationalized by the 'Immersive Learning Brain' and ‘Immersion Cube’ frameworks. This approach offers a comprehensive guide through the intricacies of immersive educational experiences and spotlighting research frontiers, along the immersion dimensions of system, narrative, and agency. Our discourse extends to stakeholders beyond the academic sphere, addressing the interests of technologists, instructional designers, and policymakers. We span various contexts, from formal education to organizational transformation to the new horizon of an AI-pervasive society. This keynote aims to unite the iLRN community in a collaborative journey towards a future where immersive learning research and practice coalesce, paving the way for innovative educational research and practice landscapes.
The cost of acquiring information by natural selection
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
Farming systems analysis: what have we learnt?.pptx
Presentation given at the official farewell of Prof Ken Gillet at Wageningen on 13 June 2024
Compexometric titration/Chelatorphy titration/chelating titration
Classification
Metal ion ion indicators
Masking and demasking reagents
Estimation of Magnisium sulphate
Calcium gluconate
Complexometric Titration/ chelatometry titration/chelating titration, introduction, Types-
1.Direct Titration
2.Back Titration
3.Replacement Titration
4.Indirect Titration
Masking agent, Demasking agents
formation of complex
comparition between masking and demasking agents,
Indicators/Metal ion indicators/ Metallochromic indicators/pM indicators,
Visual Technique,PM indicators (metallochromic), Indicators of pH, Redox Indicators
Instrumental Techniques-Photometry
Potentiometry
Miscellaneous methods.
Complex titration with EDTA.
在线办理(salfor毕业证书)索尔福德大学毕业证毕业完成信一模一样
学校原件一模一样【微信：741003700 】《(salfor毕业证书)索尔福德大学毕业证》【微信：741003700 】学位证，留信认证（真实可查，永久存档）原件一模一样纸张工艺/offer、雅思、外壳等材料/诚信可靠,可直接看成品样本，帮您解决无法毕业带来的各种难题！外壳，原版制作，诚信可靠，可直接看成品样本。行业标杆！精益求精，诚心合作，真诚制作！多年品质 ,按需精细制作，24小时接单,全套进口原装设备。十五年致力于帮助留学生解决难题，包您满意。
本公司拥有海外各大学样板无数，能完美还原。
1:1完美还原海外各大学毕业材料上的工艺：水印，阴影底纹，钢印LOGO烫金烫银，LOGO烫金烫银复合重叠。文字图案浮雕、激光镭射、紫外荧光、温感、复印防伪等防伪工艺。材料咨询办理、认证咨询办理请加学历顾问Q/微741003700
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一.毕业证【q微741003700】成绩单、使馆认证、教育部认证、雅思托福成绩单、学生卡等！
二.真实使馆公证(即留学回国人员证明,不成功不收费)
三.真实教育部学历学位认证（教育部存档！教育部留服网站永久可查）
四.办理各国各大学文凭(一对一专业服务,可全程监控跟踪进度)
如果您处于以下几种情况：
◇在校期间，因各种原因未能顺利毕业……拿不到官方毕业证【q/微741003700】
◇面对父母的压力，希望尽快拿到；
◇不清楚认证流程以及材料该如何准备；
◇回国时间很长，忘记办理；
◇回国马上就要找工作，办给用人单位看；
◇企事业单位必须要求办理的
◇需要报考公务员、购买免税车、落转户口
◇申请留学生创业基金
留信网认证的作用:
1:该专业认证可证明留学生真实身份
2:同时对留学生所学专业登记给予评定
3:国家专业人才认证中心颁发入库证书
4:这个认证书并且可以归档倒地方
5:凡事获得留信网入网的信息将会逐步更新到个人身份内，将在公安局网内查询个人身份证信息后，同步读取人才网入库信息
6:个人职称评审加20分
7:个人信誉贷款加10分
8:在国家人才网主办的国家网络招聘大会中纳入资料，供国家高端企业选择人才
Pests of Storage_Identification_Dr.UPR.pdf
InIndia-post-harvestlosses-unscientificstorage,insects,rodents,micro-organismsetc.,accountforabout10percentoftotalfoodgrains
Graininfestation
Directdamage
Indirectly
•theexuviae,skin,deadinsects
•theirexcretawhichmakefoodunfitforhumanconsumption
About600speciesofinsectshavebeenassociatedwithstoredgrainproducts
100speciesofinsectpestsofstoredproductscauseeconomiclosses
waterlessdyeingtechnolgyusing carbon dioxide chemicalspdf
The technology uses reclaimed CO₂ as the dyeing medium in a closed loop process. When pressurized, CO₂ becomes supercritical (SC-CO₂). In this state CO₂ has a very high solvent power, allowing the dye to dissolve easily.
8.Isolation of pure cultures and preservation of cultures.pdf
Isolation of pure culture, its various method.
ESA/ACT Science Coffee: Diego Blas - Gravitational wave detection with orbita...
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Presentation in the Science Coffee of the Advanced Concepts Team of the European Space Agency on the 07.06.2024.
Speaker: Diego Blas (IFAE/ICREA)
Title: Gravitational wave detection with orbital motion of Moon and artificial
Abstract:
In this talk I will describe some recent ideas to find gravitational waves from supermassive black holes or of primordial origin by studying their secular effect on the orbital motion of the Moon or satellites that are laser ranged.Sexuality - Issues, Attitude and Behaviour - Applied Social Psychology - Psyc...
A proprietary approach developed by bringing together the best of learning theories from Psychology, design principles from the world of visualization, and pedagogical methods from over a decade of training experience, that enables you to: Learn better, faster!
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Targeting Hsp90 and its pathogen Orthologs with Tethered Inhibitors as a Diagnostic and Therapeutic Strategy for cancer and infectious diseases with Dr. Timothy Haystead.Travis Hills of MN is Making Clean Water Accessible to All Through High Flux ...
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Gadgets for management of stored product pests_Dr.UPR.pdf
Insectsplayamajorroleinthedeteriorationoffoodgrainscausingbothquantitativeandqualitativelosses
Wellprovedthatnogranariescanbefilledwithgrainswithoutinsectsastheharvestedproducecontainegg(or)larvae(or)pupae(or)adultinsectinthembecauseoffieldcarryoverinfestationwhichcannotbeavoidedindevelopingcountrieslikeIndia
Simpletechnologiesfortimelydetectionofinsectsinthestoredproduceandtherebyplantimelycontrolmeasures
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Solar_and_Lunar_Eclipses1.ppt
- 1. Solar and Lunar Eclipses
- 2. What is an eclipse? • An eclipse occurs any time something passes in front of the Sun, blocking its light. This can be the Earth or the Moon.
- 3. Is there more than 1 kind of eclipse? • Yes!! There are lunar and solar eclipses. • Lunar Eclipse- When the Earth casts a shadow on the moon, causing the moon to go dark. Earth comes between the Sun and the Moon and casts a shadow on the Moon (Full Moon) • Solar Eclipse- When the Moon casts a shadow on the Earth, causing the sun to go dark. The Moon comes between the Sun and Earth and casts a shadow on part of Earth (New Moon)
- 4. Lunar Eclipses • The Earth moves between the Sun and the Moon, blocking th Sun’s light, and causing the moon to glow red.
- 5. • Umbra – The dark inner portion of the shadow cone. • Penumbral – the lighter outer portion of the shadow.
- 6. Types of Lunar Eclipses • Total Lunar Eclipse – when the Moon passes completely into the Umbra, or total shadow of the Earth. • Partial Lunar Eclipse – Occur when the Moon does not fully move into the Umbra. • Penumbral Lunar Eclipse – When the moon passes only through the penumbra, or partial shadow. They are barely visible.
- 7. Total Lunar Eclipse – when the Moon passes completely into the Umbra, or total shadow of the Earth.
- 8. Partial Lunar Eclipse – Occur when the Moon does not fully move into the Umbra
- 9. Penumbral Lunar Eclipse – When the moon passes only through the penumbra, or partial shadow. They are barely visible.
- 10. Types of Solar Eclipses • Total Solar Eclipse – can only occur if you are at the exact spot within the moon’s umbra (which isn’t very big). • Partial Solar Eclipse – Visible is you are in the penumbra of the shadow. Only some of the moon will be shadowed. • Annular Eclipse – occurs when the moon is farthest from the Earth in its orbit. This makes the moon look smaller, so during the eclipse you see an outer ring of light from the Sun.
- 11. Total Solar Eclipse – can only occur if you are at the exact spot within the moon’s umbra (which isn’t very big).
- 12. Partial Solar Eclipse – Visible if you are in the penumbra of the shadow. Only some of the moon will be shadowed.
- 13. Annular Eclipse – occurs when the moon is farthest from the Earth in its orbit. This makes the moon look smaller, so during the eclipse you see an outer ring of light from the Sun.
- 14. How often do Eclipses Happen? • That depends!! Lunar Eclipses happen more often than Solar Eclipses. • Why? Well everyone who is experiencing nighttime during a lunar eclipse can see it. • But you have to be at the exact spot on Earth to see a Solar Eclipse. • The spot on Earth is so small, that the same place only sees a Solar Eclipse every 350 years!!
- 15. Why Don’t We See Lunar Eclipses More Often? • Well, lunar eclipses don’t happen everyday because the Moon’s orbit is tilted. So, during most months, the Moon is above or below the Earth.
- 16. Eclipse Seasons • Syzygy- The times where the Moon, the Earth, and the Sun line up perfectly for an eclipse.