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  2. Pax Calendar - Wikipedia

    en.wikipedia.org/wiki/Pax_Calendar

    To get the same mean year as the Gregorian Calendar this leap week is added to 71 of the 400 years in the cycle. The years with leap week are years whose last two digits are a number that is divisible by six (including 00) or 99: however, if a year number ending in 00 is divisible by 400, then Pax is cancelled.

  3. Hanke–Henry Permanent Calendar - Wikipedia

    en.wikipedia.org/wiki/Hanke–Henry_Permanent...

    Hanke–Henry Permanent Calendar pre-2016 version with weeks still starting Sunday, but Xtra already at the end of the year. In 2004, Richard Conn Henry, a professor of astronomy at Johns Hopkins University, proposed the adoption of a calendar known as Common-Civil-Calendar-and-Time (CCC&T), which he described as a modification to a proposal by Robert McClenon.

  4. Leap year - Wikipedia

    en.wikipedia.org/wiki/Leap_year

    A leap year (also known as an intercalary year or bissextile year) is a calendar year that contains an additional day (or, in the case of a lunisolar calendar, a month) compared to a common year. The 366th day (or 13th month) is added to keep the calendar year synchronised with the astronomical year or seasonal year . [ 1 ]

  5. Leap week calendar - Wikipedia

    en.wikipedia.org/wiki/Leap_week_calendar

    The ISO week date is an example of a leap week calendar that eliminate the month. A leap week calendar can take advantage of the 400-year cycle of the Gregorian calendar, as it has exactly 20,871 weeks: with 329 common years of 52 weeks plus 71 leap years of 53 weeks, a leap week calendar would synchronize with the Gregorian every 400 years ...

  6. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    Years are given in astronomical year numbering. Augustus corrected errors in the observance of leap years by omitting leap days until AD 8. Julian calendar dates before March AD 4 are proleptic, and do not necessarily match the dates actually observed in the Roman Empire. [1]

  7. February 29 - Wikipedia

    en.wikipedia.org/wiki/February_29

    In the Gregorian calendar, the standard civil calendar used in most of the world, February 29 is added in each year that is an integer multiple of four, unless it is evenly divisible by 100 but not by 400. For example, 1900 was not a leap year, but 2000 was. The Julian calendar—since 1923 a liturgical calendar—has a February 29 every fourth ...

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    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  9. March 5 - Wikipedia

    en.wikipedia.org/wiki/March_5

    March 5 is the 64th day of the year (65th in leap years) ... 1953 – Joseph Stalin, ... 2021 – Twenty people ...

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