An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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arc of light
  کمان ِ نور  
kamân-e nur
Fr.: arc de lumière  

The apparent angular separation (→ elongation) between the → centers of the → Sun and the → Moon.

See also: → arc; → light.