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Celestial sphere

The Earth rotating within a relatively small-diameter Earth-centered celestial sphere. Depicted here are stars (white), the ecliptic (red), and lines of right ascension and declination (green) of the equatorial coordinate system
The celestial sphere is divided by the celestial equator

In astronomy and navigation, the celestial sphere is an imaginary sphere (ball) of a very large unspecified size. The earth and the sphere have the same centre: they are concentric. They also rotate upon the same axis. All objects in the sky can be thought of as projected (drawn, written) upon the celestial sphere. This imaginary sphere is a very practical tool for positional astronomy.


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Hemelbol AF كرة سماوية Arabic Esfera celeste AST Səma sferası AZ Күк сфераһы BA Нябесная сфера BE Нябесная сфэра BE-X-OLD Небесна сфера Bulgarian খ-গোলক Bengali/Bangla Esfera celeste Catalan

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