solar parallax

Solar parallax

Solar parallax\ The parallax of the sun, that is, the angle subtended at the sun by the semidiameter of the earth. It is 8."80, and is the fundamental datum.
Webster's Revised Unabridged Dictionary, © 1996, 1998 MICRA, Inc.
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WordNet
solar parallax

noun
the angle subtended by the mean equatorial radius of the Earth at a distance of one astronomical unit 
WordNet® 3.0, © 2006 by Princeton University.
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