planisphere


planisphere

noun

  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.

noun

  1. a projection or representation of all or part of a sphere on a plane surface, such as a polar projection of the celestial sphere onto a chart

n.late 14c., from Medieval Latin planisphaerium, from Latin planus (see plane (n.1)) + sphaera (see sphere (n.)).

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