planisphere


pla·ni·sphere

noun \ˈplā-nə-ˌsfir\

Definition of PLANISPHERE

:  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 \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: 1571

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