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Celestial sphere definition, the imaginary spherical shell formed by the sky, usually represented as an infinite sphere, the center of which is a given observer's position. See more.
The celestial equator is the line coplanar with the earth's equator (and 90Â° to the axis of rotation). The north celestial pole is directly above the earth's north pole and likewise for the south celestial pole.he Celestial Equatorial Coordinate System is based on the concept of the celestial sphere. The celestial sphere is an imaginary sphere of infinite radius surrounding the earth. Locations of objects in the sky are given by projecting their location onto this infinite sphere.