An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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ephemeris second
  ثانیه‌ی ِ روزیجی  
sâniye-ye ruziji
Fr.: seconde des éphémérides  

The length of a tropical second (1/31,556,925.97474 of the tropical year) on 1900 January 0.5 → ephemeris time.

See also: → ephemeris; → second.