Definitions
from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun A great circle on the celestial sphere having a plane that passes through the center of the earth and is parallel to an observer's horizon.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
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