pla·ni·sphere (pl  n -sfîr )n. 1. A representation of a sphere or part of a sphere on a plane surface. 2. Astronomy A polar projection of half or more of the celestial sphere on a chart equipped with an adjustable overlay to show the stars visible at a particular time and place. pla ni·spheric (-sfîrk, -sf r-), plani·spheri·cal (--k l) adj. |
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