An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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on-source observation
  نپاهشِ بر-خن  
nepâheš-e bar-xan
Fr.: observation sur la source  

In comparison with → off-source observation,
an observation which is concerned with the source itself.

See also: → on-; → dource;
→ observation.