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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.
(Astronomy) astronomy a celestial body around which one or more specified secondary bodies orbit: the sun is the primary of the earth. [C15: from Latin prÄ«mÄrius of the first rank, principal, from prÄ«mus first]. (ËpraÉª mÉr i, -mÉ ri). adj., n., pl.