planisphere Meaning, Definition & Usage

Plan"i*sphere noun
Etymology
Plani- + sphere: cf. F. planisphère. See Plain, and Sphere.
Definitions
  1. 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.

Webster 1913