An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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tangential motion
  جنبش ِ سایانی  
jonbeš-e sâyâni
Fr.: mouvement tangentiel  

That component of a an object’s motion which is perpendicular to the observer’s → line of sight.

See also: → tangential; → motion.