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Planisphere
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==History== [[File:F10.v. Drawing of planisphere NLW MS 735C.png|thumb|Medieval planisphere, c. 1000. [[National Library of Wales]] MS 735C, [[Aberystwyth]].]] The word planisphere (Latin ''planisphaerium'') was originally used in the second century by [[Claudius Ptolemy]] to describe the representation of a spherical Earth by a map drawn in the plane. This usage continued into the Renaissance: for example [[Gerardus Mercator]] described his [[Mercator 1569 world map|1569 world map]] as a planisphere. In this article the word describes the representation of the star-filled celestial sphere on a flat disc. The first star chart to have the name "planisphere" was made in 1624 by [[Jacob Bartsch]]. Bartsch was the son-in-law of [[Johannes Kepler]], discoverer of [[Kepler's laws of planetary motion]].
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