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
Origin of planisphere
alteration of Middle English planisperie, from Medieval Latin planisphaerium, from Latin planum plane + sphaera sphere
First Known Use: 14th century
Learn More about planisphere
Britannica.com: Encyclopedia article about "planisphere"
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