planisphere

American  

[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.

---

planisphere British  

/ ˌplænɪˈsfɛrɪk, 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

---

Other Word Forms

• planispheral adjective
• planispheric adjective
• planispherical adjective

Etymology

Origin of planisphere

1350–1400; plani- + sphere; replacing Middle English planisperie < Medieval Latin plānisphaerium

Example Sentences

The Getty exhibits a planisphere clock, demonstrating mean time and solar time in cities around the globe, as well as the timing of the tides in northern ports.

From The Guardian • Jul. 29, 2011

In summer I sometimes come outside at night with my torch and my planisphere, which is two circles of plastic with a pin through the middle.

From "The Curious Incident of the Dog in the Night-Time" by Mark Haddon

Draw back the curtain and thou wilt descry the enchanter, Al-Shamardal, lying upon a couch of gold, with something at his head round and shining like the moon, which is the celestial planisphere.

From The Book of the Thousand Nights and a Night — Volume 06 by Burton, Richard Francis, Sir

Part of the two dollars father spoke of went for a book called "The Friendly Stars," and seventy-five cents we spent for the most entertaining thing our family ever bought—a planisphere.

From Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place by Rogers, Julia Ellen

If I had only a dollar or less to spend on astronomy I should buy a planisphere.

From Earth and Sky Every Child Should Know Easy studies of the earth and the stars for any time and place by Rogers, Julia Ellen