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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.
Any point of the celestial (i.e. the position of a star or planet) can be referenced with a unique Right Ascension and Declination. The celestial sphere has a north and south celestial pole as well as a celestial equator which are projected from reference points from the Earth surface.