Time - Julian Day Number (JDN)


Julian Day Number (JDN) is numeric time representation that is defined as:

  • the number of days
  • since noon in Greenwich (UTC)
  • on November 24,
  • the first day of 4714 B.C.
  • according to the proleptic Gregorian calendar.

To more recently, in Terrestrial Time which differs from UTC by a few seconds.

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