Category:Planisphere

Plan"i*sphere, n. Etym: [plani- + sphere: cf. F. planisphère. See Plain, and sphere.]

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.