Look up planisphere in Wiktionary, the free dictionary.
Planisphere or planisphaerium may refer to:
Astronomy and cartography
Planisphere or Planisphaerium, a 2nd-century AD book by Claudius Ptolemy about mapping the celestial sphere onto a flat plane using the stereographic projection to make a star chart
Planispheric astrolabe, a device consisting of a planisphere joined to a dioptra, used for observing stars and performing astronomical calculations
Planisphere, a cardboard or plastic adjustable star chart based on the planispheric astrolabe
Planisphere projection, or stereographic projection, a conformal map projection which takes spherical circles to planar circles
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