An Etymological Dictionary of Astronomy and Astrophysics

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فرهنگ ریشه‌شناختی اخترشناسی-اخترفیزیک

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modified Julian date (MJD)
  گاهداد ِ ژولی‌ین ِ واترزیده  
gâhdâd-e žulian-e vâtarzidé
Fr.: date julienne modifiée  

A modification of the Julian Date, representing the number of days that have elapsed since midnight (instead of noon) at the beginning of Wednesday November 17, 1858. MJD = JD - 2,400,000.5 The reason for adopting that date is the fact that
the Julian Day 2,400,000 just happens to be November 17, 1858.

See also: → modify; → Julian date.