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The constant 153 is the number of days every 5 months (in the same year starting on March 1) excepting the addition of 1 day on July 31 and December 31. Examples with a non-leap secular year (of rank 3)
Note that Julian days begin at noon (hour = 12) and thus hours 0–11 of a solar day are one Julian day earlier than hours 12–23. The value may extend outside of the normal range and is considered as additional number of julian days (a Julian day is 24 hours or 86400 seconds exactly, ignoring any adjustment of leap seconds within the UTC ...
Note that Julian days begin at noon (hour = 12) and thus hours 0-11 of a solar day are one Julian day earlier than hours 12-23. The value may extend outside of the normal range and is considered as additional number of julian days (a Julian day is 24 hours or 86400 seconds exactly, ignoring any adjustment of leap seconds within the UTC calendar).
This template takes a julian day number and returns the associated day of month within the Gregorian calendar. Computing formula (partially indented) For more information about how this formula works, see Julian day .
The Julian date (JD) of any instant is the Julian day number plus the fraction of a day since the preceding noon in Universal Time. Julian dates are expressed as a Julian day number with a decimal fraction added. [8] For example, the Julian Date for 00:30:00.0 UT January 1, 2013, is 2 456 293.520 833. [9]
No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the
{{JD|1582|10|15|12|00|00}} returns 2299161 (this is the first instant of a Gregorian date, on 15 October at noon, i.e. 5 October at noon in the previous Julian calendar). {{JD|1582|10|15|11|59|59}} returns 2299170.9999884 (this is still a date of the Julian calendar after the Gregorian change, and it is actually still the 14th of October before ...
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