from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A great circle on the celestial sphere in the same plane as the earth's equator.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun astronomy A
great circleon the celestial sphere, coincident with the plane of earth's equator.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the great circle on the celestial sphere midway between the celestial poles
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