An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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fractional sky coverage
  پوشش ِ برخه‌ای ِ آسمان  
pušeš-e barxe-yi-ye âsmân
Fr.: couverture partielle du ciel  

The portion of the 4π → steradians of the sky that a radiotelescope can observe from a given location on Earth over a 24-hour time interval.

See also: → fractional; → sky; → coverage.