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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.
celestial sphere. An imaginary sphere with Earth at its center. The stars, planets, Sun, Moon, and other celestial bodies appear to be located on this sphere, and the sphere appears to rotate around the Earth's extended axis once every 24 hours, carrying the celestial bodies with it overhead and giving them their diurnal motions.