Epoch  (Astronomy)

updated: 2023-07-18

The currently-used standard epoch "J2000.0" is defined by international agreement to be equivalent to:

  1. The Gregorian date January 1, 2000, at 12:00 TT (Terrestrial Time).
  2. The Julian date 2451545.0 TT (Terrestrial Time).[12]
  3. January 1, 2000, 11:59:27.816 TAI (International Atomic Time).[13]
  4. January 1, 2000, 11:58:55.816 UTC (Coordinated Universal Time).[14]


[1]: Epoch (Astronomy) on Wikipedia

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