An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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lunar parallax
  دیدگشت ِ مانگی  
didgašt-e mângi
Fr.: parallaxe lunaire  

The apparent shift in the → Moon’s position relative to the background stars when observed from different places on Earth. The first parallax determination was for the Moon, by Hipparchus (150 B.C.). He determined that one-fifth of the Sun’s angular diameter corresponded to the lunar parallax between Hellespont and Alexandria.

See also: → lunar; → parallax.