An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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secular perturbation
  پرتورش ِ دیریاز  
partureš-e diryâz
Fr.: perturbation séculaire  

A variation of planetary orbital elements which is always in the same direction as time increases.

See also: → secular; → perturbation.