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celestial equator

noun, Astronomy, Navigation.
1.
the great circle of the celestial sphere, lying in the same plane as the earth's equator.
Origin of celestial equator
1870-1875
First recorded in 1870-75
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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Examples from the Web for celestial equator
Historical Examples
  • Referring to the time when the sun passes the celestial equator.

  • The celestial equator, like the terrestrial, is 90° from the pole.

    The Royal Observatory Greenwich

    E. Walter (Edwared Walter) Maunder
  • The angle of elevation of the celestial equator to the horizon varies according to the position of the observer.

    Astronomical Lore in Chaucer Florence M. Grimm
  • Then the zenith would be on the celestial equator and the north and south poles of the heavens would be on the horizon.

    Astronomical Lore in Chaucer Florence M. Grimm
  • When the sun is south of the celestial equator its apparent daily path is the same as it would be for a star so situated.

    Astronomical Lore in Chaucer Florence M. Grimm
  • The line of intersection will be a great circle of the celestial sphere, called the celestial equator.

  • The celestial equator is a great circle of the sky distant 90 from the poles.

    A Text-Book of Astronomy George C. Comstock
  • We may remark that the main part of the zodiacal light shifts to the south side of the celestial equator as we cross the line.

  • Its plane is inclined about 63 to the celestial equator and its poles lie in the constellations of Coma Berenicis and Cetus.

    Astronomy for Young Folks Isabel Martin Lewis
  • The celestial equator is the great circle in which the plane of the earth's equator intersects the celestial sphere.

    Astronomy for Young Folks Isabel Martin Lewis
British Dictionary definitions for celestial equator

celestial equator

noun
1.
the great circle lying on the celestial sphere the plane of which is perpendicular to the line joining the north and south celestial poles Also called equinoctial, equinoctial circle
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 equator in Science
celestial equator  
A great circle separating the northern and southern hemispheres of the celestial sphere and lying in the same plane as the Earth's equator. The celestial equator is a projection of the Earth's equator outward onto the celestial sphere and is used as the reference point in determining a celestial body's declination.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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