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planisphere

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noun pla·ni·sphere \ˈplā-nə-ˌsfir\

Definition of planisphere

  1. :  a representation of the circles of the sphere on a plane; especially :  a polar projection of the celestial sphere and the stars on a plane with adjustable circles or other appendages for showing celestial phenomena for any given time

pla·ni·spher·ic play \ˌplā-nə-ˈsfir-ik, -ˈsfer-\ adjective


Origin of planisphere

alteration of Middle English planisperie, from Medieval Latin planisphaerium, from Latin planum plane + sphaera sphere


First Known Use: 14th century


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