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The Julian calendar has two types of year: "normal" years of 365 days and "leap" years of 366 days. There is a simple cycle of three "normal" years followed by a leap year and this pattern repeats forever without exception. The Julian year is, therefore, on average 365.25 days long.
The solar cycle is a 28-year cycle of the Julian calendar, and 400-year cycle of the Gregorian calendar with respect to the week. It occurs because leap years occur every 4 years, typically observed by adding a day to the month of February, making it February 29th. There are 7 possible days to start a leap year, making a 28-year sequence. [1]
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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 month from a JD, in the Gregorian calendar)
The Revised Julian leap rule omits seven of nine century leap years, leaving 225−7 = 218 leap days per 900-year cycle. Thus the calendar mean year is 365 + 218 ⁄ 900 days, but this is actually a double-cycle that reduces to 365 + 109 ⁄ 450 = 365.24 2 days, or exactly 365 days 5 hours 48 minutes 48 seconds, which is exactly 24 seconds ...
This template can be used to wrap dates that are given in the Julian Calendar, to 'protect' them from autoformatting templates like {{}}.The template returns the exact string given as the first parameter, but wraps it in an HTML span with the "date-julian" class.
This table cycles every 28 years, except in the Gregorian calendar on years that are a multiple of 100 (such as 1800, 1900, and 2100 which are not leap years) that are not also a multiple of 400 (like 2000 which is still a leap year). The full cycle is 28 years (1,461 weeks) in the Julian calendar and 400 years (20,871 weeks) in the Gregorian ...
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 month from a JD, in the Gregorian calendar) Template:JULIANDAY.HOUR ...