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I have written a page, and some code to calculate the Heliocentric Julian date (HJD) which differes slightly from the MJD and JD dates since it is dependent on the position of a source, and the light-travel time between the source and Earth as seen from the Sun.
I always get Julian dates mixed up (not anymore after writing the HJD code...) so the following are to make sure I get mixed up following someone else's advice. JD has integer values at 1200 UT. So, JD 2450495 = 1200 UT on 15/2/1997. 0000 UT 15/2/1997 would be 2450494.5
Modified Julian date has integer values at 0000 UT and is formed from JD by: MJD = JD - 2400000.5 so MJD 50494 = 0000 UT 15/2/1997. To contrast this, Truncated Julian date is MJD - 40000. The tables below are handy calendars on 0000 UT for 1996,7 and 8. Each table is MJD - 50000. (Taken from the TJD tables at www.gamma.mpe-garching.mpg.de/~hcs/PLANS/tjd1996.table etc).
MJD for:
1996,
1997,
1998,
1999,
2000
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Last Updated: 14 March 2002. Richard Ogley |
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