celestial equator

noun Astronomy, Navigation.
the great circle of the celestial sphere, lying in the same plane as the earth's equator.


Origin:
1870–75

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Collins
World English Dictionary
celestial equator
 
n
equinoctial, Also called: equinoctial circle the great circle lying on the celestial sphere the plane of which is perpendicular to the line joining the north and south celestial poles

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
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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Example sentences
Declination is often used to orient to the stars, in relationship to the celestial equator.
Attached to the inside of this ring is a wide band dedicated with the signs of the zodiac and representing the celestial equator.
Image for celestial equator
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