An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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proper motion distance
  دورای ِ جنبش ِ سره  
durâ-ye jonbeš-e saré
Fr.: distance mouvement propre  

The distance derived from the → proper motion of an object. If an object has a known → transverse velocity  u, and has an observed angular motion of dθ/dt, then the proper motion distance is defined as: d = u/(dθ/dt).

See also: → proper; → motion; → distance