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See celestial equator.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
(Astronomy) another name for celestial equator
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|Noun||1.||equinoctial circle - the great circle on the celestial sphere midway between the celestial poles|
great circle - a circular line on the surface of a sphere formed by intersecting it with a plane passing through the center
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