The Sky
Astronomy is about us. As we learn about astronomy, we learn about ourselves. We search for an answer to the question “What are we?” The quick answer is that we are thinking creatures living on a planet that circles a star we call the sun. In this chapter, we begin trying to understand that answer. What does it mean to live on a planet?
The preceding chapter gave us a quick overview of the universe, and chapters later in the book will discuss the details. This chapter and the next help us understand what the universe looks like seen from the surface of our spinning planet.
But appearances are deceiving. We will see in Chapter 4 how difficult it has been for humanity to understand what we see in the #sky every day. In fact, we will discover that modern science was born when people tried to understand the appearance of the sky.
Brilliant Lecture delivered to me in Alagappa Engineering college Workshop.
The Global Positioning System (GPS) is a satellite
based radio navigation system provided by the
United States Department of Defence. It gives
unequaled accuracy and flexibility in positioning
for navigation, surveying and GIS data collection.
What is Universal Time (UTC)? Why is it for? How does UTC relate to Greenwich Mean Time (GMT) and Eastern Standard Time (EST)?
What is an Atomic clock? What is a leap-second? What is the Meridian and what is the International Date Line? Why are fractions of a second and UTC important in the 21st century?
The Sky
Astronomy is about us. As we learn about astronomy, we learn about ourselves. We search for an answer to the question “What are we?” The quick answer is that we are thinking creatures living on a planet that circles a star we call the sun. In this chapter, we begin trying to understand that answer. What does it mean to live on a planet?
The preceding chapter gave us a quick overview of the universe, and chapters later in the book will discuss the details. This chapter and the next help us understand what the universe looks like seen from the surface of our spinning planet.
But appearances are deceiving. We will see in Chapter 4 how difficult it has been for humanity to understand what we see in the #sky every day. In fact, we will discover that modern science was born when people tried to understand the appearance of the sky.
Brilliant Lecture delivered to me in Alagappa Engineering college Workshop.
The Global Positioning System (GPS) is a satellite
based radio navigation system provided by the
United States Department of Defence. It gives
unequaled accuracy and flexibility in positioning
for navigation, surveying and GIS data collection.
What is Universal Time (UTC)? Why is it for? How does UTC relate to Greenwich Mean Time (GMT) and Eastern Standard Time (EST)?
What is an Atomic clock? What is a leap-second? What is the Meridian and what is the International Date Line? Why are fractions of a second and UTC important in the 21st century?
The Charming Genius of the Apollo Guidance ComputerBrian Troutwine
The Apollo Project was the first flight system to deploy with a digital, general-purpose computer made of integrated circuits at its core: the Apollo Guidance Computer (AGC). It was a complete research project: no IC computer had run consecutively for more than a few hours, sophisticated programming techniques were unknown and the interactive human/computer interface had to be invented and made to appeal to astronauts opposed to machine interference in flight operations.
In this talk I'll give the historical context for the AGC, discuss its initial design and the evolution of this design as the Apollo Project progressed. We'll do a deep-dive on the machine architecture and note how tight integration with a special-purpose vehicle admitted incredibly sophisticated behaviour from a primitive machine. We'll further discuss the human/computer interface for the AGC, how the astronaut's flight roles dictated the computer's role and vice versa. Motivating examples from select Apollo flights will be used.
Throughout, we'll keep an eye on lessons to be gleaned from the experience of engineering the AGC and how we can adapt these lessons to modern computer systems in mission-critical deployments.
Celestial bodies in the Solar System: the Sun, planets, satellites, comets, a...andare2
For primary students in grade 4 in Madrid bilingual state schools.
For more quality educational content, visit my YouTube channel:
https://www.youtube.com/channel/UCQGYTvyHHivB7GT9q04vT0A
The inscrutable imaginary number, so useful and yet so intriguing. Explain why this is so and how important it is to quantum mechanics, resulting in the ultimate quantum.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
7. TRANSFORMATION FROM HORIZONTAL
SYSTEM TO EQUATORIAL SYSTEM
Measured observed coordinates in the horizontal system, azimuth A
and altitude a, can be transformed to (co-rotating) equatorial ones,
hour angle HA and declination Dec, for an observer at geographical
latitude B, by the transformation formulae:
cos Dec * sin HA = cos a * sin A
sin Dec = sin B * sin a + cos B * cos a * cos A
cos Dec * cos HA = cos B * sin a + sin B * cos a * cos A
8. EFFECT OF EARTH’S ROTATION
• Objects seem to rotate around the celestial poles
• Move along the circle of constant declination
• Culmination of Circumpolar objects
One of the basic needs of astronomy, as well as other physical sciences, is to give reasonable descriptions for the positions of objects relative to each other.
Scientifically, this is done in mathematical language, by properly assigning numbers to each position in space; these numbers are called coordinates and the system defined by this procedure a coordinate system.
We specify locations and directions on the Earth with the cardinal directions, North, East, South, West.
The term"meridian"generally refers to any line that runs pole to pole, on the surface of a sphere.
Compared to the size of Earth, all celestial objects (with the exception of some satellites and meteorites in Earth's atmosphere) are far away.
Viewing them, they look all at far distance, which can not be distinguished easily, so that they look as being positioned on a far-away sphere.
Thus each observer can look at the skies as being manifested on the interior of a big sphere, the so-called celestial sphere.
Equatorial coordinates, also called simply celestial coordinates, are the standard coordinate system for the sky.
It is meant for the fixed sphere of the stars within which the Earth and Sun move.
The equatorial system is almost the same as Earth's coordinate system, since it is also defined by the Earth's axis and equator.
The celestial equator is the projection of Earth's equator onto the sky, and the North and South celestial poles (NCP and SCP) are the points on the sky directly above Earth's North and South poles.
The horizon system is defined locally for each observer, or site, on Earth (or another celestial body).
Its origin is the observer's location, its reference axis is the local vertical or plumb line (defined e.g. by the local gravitational field), and its reference plane is the apparent horizon or simply horizon perpendicular to it at the observer's location.
The direction directly, or vertically, above the observer, or its intersection point with the virtual celestial sphere, is called zenith, the opposite direction or point, vertically below the observer, is called nadir.
Stars and other celestial bodies appear to rotate around the celestial poles (as actually Earth rotates and carries the observer away below them), i.e. move along circles of constant declination in the co-rotating equatorial system.
By doing so, stars will cross the local meridian (defined e.g. by zero hour angle HA) twice a day; these events are called transits or culminations, i.e., the upper and the lower transit, or the upper and the lower culmination. These events also mark the maximal and minimal altitude a the objects can reach in the observer's sky, and may both take place above or below the horizon of the observer, depending on the declination Dec of the object and the geographic latitude B of the observer.