Meaning of planisphere

plan•i•sphere

Pronunciation: (plan'u-sfēr", plā'nu-), [key]
— n.
  1. a map of half or more of the celestial sphere with a device for indicating the part of a given location visible at a given time.
  2. a projection or representation of the whole or a part of a sphere on a plane.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.