Celestial sphere | Wikipedia audio article
Channel: wikipedia tts
Date: 23/06/2019

This is an audio version of the Wikipedia Article:
https://en.wikipedia.org/wiki/Celestial_sphere


00:00:42 1 Introduction
00:04:08 2 Celestial coordinate systems
00:05:28 3 History
00:06:11 4 Star globe
00:06:45 5 Bodies other than Earth
00:07:15 6 See also



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Speaking Rate: 0.9068104729299462
Voice name: en-AU-Wavenet-D


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SUMMARY
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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 observer, half of the sphere would resemble a hemispherical screen over the observing location.
The celestial sphere is a practical tool for spherical astronomy, allowing astronomers to specify the apparent positions of objects in the sky if their distances are unknown or irrelevant. In the equatorial coordinate system, the celestial equator divides the celestial sphere into two halves: the northern and southern celestial hemispheres.