An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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arc of vision
  کمان ِ دید  
kamân-e did
Fr.: arc de vision  

The → angular  → difference in → altitude between the → Sun and the → Moon.

See also: → arc; → vision.