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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
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]
The offset 32.184 seconds was the 1976 estimate of the difference between Ephemeris Time (ET) and TAI, "to provide continuity with the current values and practice in the use of Ephemeris Time". [ 9 ] TAI is never revised once published and TT(TAI) has small errors relative to TT(BIPM), [ 6 ] on the order of 10-50 microseconds.
The Gregorian calendar was implemented in Russia on 14 February 1918 by dropping the Julian dates of 1–13 February 1918, [h] pursuant to a Sovnarkom decree signed 24 January 1918 (Julian) by Vladimir Lenin. The decree required that the Julian date was to be written in parentheses after the Gregorian date, until 1 July 1918. [19]
The Julian day number is a simplified time-keeping system originally intended to ease calculation with historical dates which involve a diversity of local, idiosyncratic calendars. It was adopted by astronomers in the mid-1800s, and identifies each date as the integer number of days that have elapsed since a reference date ( "epoch" ), chosen ...
A commonly used value in Lilius's time, from the Alfonsine tables, is 365.2425463 days. [13] As the average length of a Julian year is 365.25 days, the Julian year is almost 11 minutes longer than the mean tropical year. The discrepancy results in a drift of about three days every 400 years.
The Barycentric Julian Date (BJD) is the Julian Date (JD) corrected for differences in the Earth's position with respect to the barycentre of the Solar System. Due to the finite speed of light , the time an astronomical event is observed depends on the changing position of the observer in the Solar System.
This template returns the julian day number for now (based on the current UTC time on the Wikipedia server). Syntax: {{CURRENTJULIANDAY}} See also: Template:CURRENTYEARCC Template:CURRENTYEARYY Template:CURRENTCENTURY Template:CURRENTMONTHDAYS Template:CURRENTISOYEAR Template:CURRENTWEEKDAY Template:CURRENTMINUTE Template:JULIANDAY