An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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standard epoch
  زیمه‌ی ِ استانده  
zime-ye estândé
Fr.: époque de référence  

A particular date and time that specifies the reference system to which celestial coordinates are referred. From 1984 the → Julian year is used, as denoted by the prefix J, e.g. J2000.0.

See also: → standard; → epoch.