An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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celestial horizon
  افق ِ آسمانی  
ofoq-e âsmâni (#)
Fr.: horizon céleste  

A great circle on the → celestial sphere having a plane that passes through the center of the Earth at a right angle to the line formed by an observer’s → zenith and → nadir.

See also: → celestial; → horizon.