Planisphere
Pronunciation : Plan"i*sphere
Part of Speech : n.
Etymology : [Plani- + sphere: cf. F. planisph?re. See Plain, and Sphere.]
Definition : Defn: 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.
Source : Webster's Unabridged Dictionary, 1913