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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
A Julian year should not be confused with the Julian day, which is also used in astronomy (more properly called the Julian day number or JDN). The JDN uniquely specifies a place in time, without becoming bogged down in its date-in-month, week, month, or year in any particular calendar.
Template:JULIANDAY.JULIAN (version taking a date in the Julian calendar) Template:JD (automatic Julian or Gregorian calendar determination) Template:JULIANDAY.YEAR (returns the year from a JD, in the Gregorian calendar) Template:JULIANDAY.MONTH (returns the month from a JD, in the Gregorian calendar) Template:JULIANDAY.DAY (returns the day of ...
A calendrical calculation is a calculation concerning calendar dates. Calendrical calculations can be considered an area of applied mathematics. Some examples of calendrical calculations: Converting a Julian or Gregorian calendar date to its Julian day number and vice versa (see § Julian day number calculation within that article for details).
24 November 2024 Usage ... Hatcher, D. A. (1984). Simple formulae for Julian day numbers and calendar dates. Quarterly Journal of the Royal Astronomical Society, 25 ...
{{JULIANDAY.JULIAN|325|3|21}} returns 1839844 (spring equinox observed at the Christian First Council of Nicaea, taken as a reference for aligning the Julian calendar to the proleptic Gregorian calendar) {{JULIANDAY.JULIAN|1582|10|4}} returns 2299160 (last day of the Julian calendar before the transition to the Gregorian calendar)
Fred Espenak of NASA lists 50 phases of the Moon within year 0, showing that it is a full year, not an instant in time. [4] Jean Meeus gives the following explanation: [11] There is a disagreement between astronomers and historians about how to count the years preceding year 1. In [Astronomical Algorithms], the 'B.C.' years are counted ...
The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts of Oriental Orthodoxy as well as by the Amazigh people (also known as the Berbers).