- published: 24 Jul 2011
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In astronomy and navigation, the celestial sphere is an imaginary sphere of arbitrarily large radius, concentric with Earth. All objects in the observer's sky can be thought of as projected upon the inside surface of the celestial sphere, as if it were the underside of a dome or a hemispherical screen. The celestial sphere is a practical tool for spherical astronomy, allowing observers to plot positions of objects in the sky when their distances are unknown or unimportant.
Because astronomical objects are at such remote distances, casual observation of the sky offers no information on the actual distances. All objects seem equally far away, as if fixed to the inside of a sphere of large but unknown radius, which rotates from east to west overhead while underfoot, the Earth seems to stand still. For purposes of spherical astronomy, which is concerned only with the directions to objects, it makes no difference whether this is actually the case, or if it is the Earth which rotates while the celestial sphere stands still.
Basics of Astronomy: The Celestial Sphere
Lesson Two Lecture One - The Celestial Sphere & Celestial Coordinates
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ASTR 1P01, CLIP 21: The Celestial Sphere; Introduction to Daily and Annual Motion (Hand-Drawn)
Introductory Astronomy: Positions on the Celestial Sphere
Celestial Sphere
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Terrestrial/Celestial Spheres Coordinate Systems Tutorial
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Lecture2a (Celestial Sphere Introduction)
A series of videos explaing basics of Astronomy from the Big Ban and creation of the Univers, Time and Space down to Solar System
How the Sky Moves Getting oriented, Learn why the stars appear to move as they do, understand the celestial coordinate system, The Plane of the ecliptic and the Meridian. More: https://www.udemy.com/backyard-astronomy-2/?couponCode=BYA2
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Introductory Astronomy lecture on the celestial sphere and how to start thinking of horizon diagrams. Refers to tutorial 1 ("Position") from "Lecture Tutorials for Introductory Astronomy". Video is intended for students taking astronomy at Westchester Community College. The video is unpolished, except for some audio tweaking. Image of Earth and video of rotating Earth is from NASA: http://visibleearth.nasa.gov/view.php?id=57760 Simulations of celestial sphere are from Kevin Lee's Astronomy Education page at the University of Nebraska - Lincoln: http://astro.unl.edu/classaction/animations/coordsmotion/celhorcomp.html and http://astro.unl.edu/classaction/animations/coordsmotion/celestialhorizon.html "Lecture Tutorials for Introductory Astronomy" by Prather, et al published by Pearson Hig...
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This video explains the coordinate systems used in celestial navigation, with an overview of the terrestrial and celestial spheres. This video is part of a series that teaches celestial navigation using techniques that have been used for centuries. In this course, you will learn some basics needed to find your location using a sextant and elementary math. This course is free and available to everyone, and should take less than two hours to complete. The course is hosted by Vanderbilt University at: https://my.vanderbilt.edu/astronav/
This video is an introduction to the topic of the celestial sphere and explains such concepts as the celestial equator, celestial north pole, ecliptic, zodiac, zenith, nadir, horizon. It also explains why the ecliptic is tilted from the celestial equator and why the planets are always found in the zodiac.
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This tutorial is intended to help you understand how a celestial sphere diagram looks when we are studying the Sun's apparent path. Please note- the word "altitude" refers to the angle up from the horizon that you would have to look in order to see the Sun at mid-day (solar noon)
Introduction to the the celestial sphere, the tilt of the Earth's axis, Earth's revolution, and the causes of the seasons.
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In this video, we learn the difference between the diurnal (daily) motion and annual motion of stars and how they are tied to Earth's rotation and revolution. We also learn about the precession of Earth's axis and what effects it will have on us.
EGS Astronomy Course - 1: Moving Sky Lesson 01 Daily (diurnal) rotation of the sky Constellations and Asterisms Celestial Sphere Seasons and the Year Sun's annual motion around Celestial Sphere Summer and Winter Solstice Spring and Autumn Equinox Ecliptic and Zodiac
Skynet University: http://skynet.unc.edu/introastro Use Our Telescopes From Anywhere! Astronomy 101: The Solar System Lesson 1: Celestial Motions Topic: Motion of the Celestial Sphere Next: Sun-Earth-Moon Scale Model (http://youtu.be/ksLErDRXFi8) Previous: Constellations and the Celestial Sphere (http://youtu.be/hGoBe3J0SJM) In Lesson 1, we explore the apparent motions of the stars, the sun, and the moon. We explain the apparent motions of the stars and the sun in terms of the motions of Earth: its daily spin on its axis, its annual orbit around the sun, and the long-term precession of its spin axis. We learn how length of day and the height of the sun in the sky at midday vary with season and latitude. We explore lunar phases, lunar and solar eclipses, and the cycle over which...
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This video explains what the Altitude and Azimuth angle of stars is and how to compute them based on one's location on earth and the direction that they are viewing.