Julian date



  • (written as Julian Date)
    Date in years, days and decimals of a day, taken from the arbitrary start date of 465BC and with the days counted from noon rather than midnight. Julian dates figure in much astronomical calculation and reckoning, with the abbreviation JD. They are unrelated to the Julian calendar.
  • acronymJD
    (written as Julian Date)


  • noun a date expressed as the number of days since 1 January of the current year, so that, e.g. 1 February would appear as 032