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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 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.
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From: WordNet (r) 2.0

 solar parallax
      n : the angle subtended by the mean equatorial radius of the
          Earth at a distance of one astronomical unit