An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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ephemeris meridian
  نیمروزان ِ روزیجی  
nimruzân-e ruziji
Fr.: méridien des éphémérides  

A fictitious meridian that rotates independently of the Earth at the uniform rate implicitly defined by
→ Terrestrial Dynamical Time (TDT).

See also: → ephemeris; → meridian.