An Etymological Dictionary of Astronomy and Astrophysics

English-French-Persian

فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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plane of the sky
  هامن ِ آسمان  
hâmon-e âsmân
Fr.: plan du ciel  

An imaginary plane that is perpendicular to the → line of sight.

See also: → plane; → sky.