An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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off-source observation
  نپاهش ِ اپ-خن  
nepâheš-e ap-xan
Fr.: observation hors source  

An observation when the telescope is pointed away from the source in order to measure the sky background contribution.

See also: → off-; → source;
→ observation.