from The American Heritage® Dictionary of the English Language, 4th Edition
- n. 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. Also called rational horizon.
from the GNU version of the Collaborative International Dictionary of English
- n. See def. 2, above.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- n. the great circle on the celestial sphere whose plane passes through the sensible horizon and the center of the Earth
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