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- The celestial sphere is a conceptual tool used in spherical astronomy to specify the position of an object in the sky without consideration of its linear distance from the observer. The celestial equator divides the celestial sphere into northern and southern hemispheres.en.wikipedia.org/wiki/Celestial_sphere
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Celestial sphere - Wikipedia
In astronomy and navigation, the celestial sphere is an abstract sphere that has an arbitrarily large radius and is concentric to Earth. All objects in the sky can be conceived as being projected upon the inner surface of the celestial sphere, which may be centered on Earth or the observer. If centered on the … See more
Because astronomical objects are at such remote distances, casual observation of the sky offers no information on their actual distances. All celestial objects seem equally far away, as… See more
These concepts are important for understanding celestial coordinate systems, frameworks for measuring the positions of objects in… See more
A celestial sphere can also refer to a physical model of the celestial sphere or celestial globe. Such globes map the constellations on … See more
Observers on other worlds would, of course, see objects in that sky under much the same conditions – as if projected onto a dome. Coordinate systems based on the sky of that world could be constructed. These could be based on the equivalent "ecliptic", poles and … See more
The ancients assumed the literal truth of stars attached to a celestial sphere, revolving about the Earth in one day, and a fixed Earth. The Eudoxan planetary model, on which the Aristotelian and Ptolemaic models were based, was the first geometric … See more
Wikipedia text under CC-BY-SA license Celestial spheres - Wikipedia
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WebLearn about the celestial sphere, the apparent surface of the heavens on which the stars seem to be fixed. Find out how it is used to mark the …
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WebAn armillary sphere (variations are known as spherical astrolabe, armilla, or armil) is a model of objects in the sky (on the celestial sphere), consisting of a spherical framework of rings, centered on Earth or the Sun, that …
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WebEncyclopædia Britannica, Inc. Diagram stars, planets, constellations, and other heavenly bodies by understanding Earth's celestial sphere. What happens during a solar eclipse. Consider how Isaac Newton's discovery …
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Celestial sphere - Wikipedia