An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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arc of separation
  کمان ِ جدایی  
kamân-e jodâyi
Fr.: arc de séparation  

The difference in → right ascension between the → Sun and the → Moon,
measured in degrees.

See also: → arc; → separation.