An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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space motion
  جنبش ِ فضایی  
jonbeš-e fazâyi
Fr.: mouvement spatial  

The velocity and direction of motion of a star or celestial object with respect to the Local Standard of Rest. Same as → peculiar velocity.

See also: → space; → motion.