'Planisphere' definitions:
Definition of 'Planisphere'
From: GCIDE
- Planisphere \Plan"i*sphere\, n. [Plani- + sphere: cf. F. planisph[`e]re. See Plain, and Sphere.] The representation of the circles of the sphere upon a plane; especially, a representation of the celestial sphere upon a plane with adjustable circles, or other appendages, for showing the position of the heavens, the time of rising and setting of stars, etc., for any given date or hour. [1913 Webster]