An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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Barycentric Dynamical Time (TDB)
  زمان ِ توانیک ِ گرانیگاهی  
zamân-e tavânik-e gerânigâhi
Fr.: temps dynamique barycentrique (TDB)  

A time scale previously used in calculations of the orbits of solar system objects (planets, asteroids, comets, and interplanetary spacecrafts). It was based on the Terrestrial Dynamical Time, but took the relativistic effect of time dilation into account to move the origin to the solar system barycenter. It is now superseded by → Barycentric Coordinate Time (TCB).

See also: → barycenter; → dynamical; → time.