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90s Slang You Should Know

celestial equator

noun, Astronomy, Navigation.
the great circle of the celestial sphere, lying in the same plane as the earth's equator.
Origin of celestial equator
First recorded in 1870-75 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for celestial equator

celestial equator

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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