Planisphere



[plan-uh-sfeer, pley-nuh-] /ˈplæn əˌsfɪər, ˈpleɪ nə-/

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.
/ˈplænɪˌsfɪə/
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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