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celestial sphere

noun
1.
the imaginary spherical shell formed by the sky, usually represented as an infinite sphere, the center of which is a given observer's position.
Origin
1875-1880
1875-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Examples from the web for celestial sphere
  • The point on any given observer's celestial sphere diametrically opposite of one's zenith.
British Dictionary definitions for celestial sphere

celestial sphere

noun
1.
an imaginary sphere of infinitely large radius enclosing the universe so that all celestial bodies appear to be projected onto its surface
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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celestial sphere in Science
celestial sphere  

An imaginary sphere with Earth at its center. The stars, planets, Sun, Moon, and other celestial bodies appear to be located on this sphere, and the sphere appears to rotate around the Earth's extended axis once every 24 hours, carrying the celestial bodies with it overhead and giving them their diurnal motions. The celestial sphere is essentially a spherical map of the sky that provides the basis for the coordinate systems used in celestial navigation and in specifying the positions and motions of celestial objects. See more at altazimuth coordinate system, ecliptic coordinate system, equatorial coordinate system.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Difficulty index for celestial sphere

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Word Value for celestial

11
14
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