An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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sky subtraction
  زیرکرشش ِ آسمان  
zirkaršeš-e âsmân
Fr.: soustraction de ciel  

The act or instance of removing the contribution of non-related, intervening foreground light to the object.

See also: → sky; → subtraction.