julijanski datum
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Julian date
IPA: / ˈdʒuːliən ˈdeɪt /1. A date expressed as the number of days elapsed since January 1, 4713 B.C. (on the Julian calendar)for example, 2,450,000 for October 9, 1995 (Gregorian). Julian dates are useful for finding elapsed times between events that may be many years apart, as in astronomy. The starting point is the beginning of the Julian Period, defined in 1583 by Joseph Scaliger as the coincidence of several cycles based on the Julian calendar. See also Gregorian calendar, Julian calendar.
2. Often (but incorrectly), a date expressed as the year and the number of days elapsed since the beginning of the yearfor example, 91.13 for January 13, 1991. Acronym: JD.