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  2. Conversion between Julian and Gregorian calendars - Wikipedia

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

    Years affected are those which divide by 100 without remainder but do not divide by 400 without remainder (e.g., 1900 and 2100 but not 2000). No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates).

  3. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The International Fixed Calendar (also known as the Cotsworth plan, the Cotsworth calendar, the Eastman plan or the Yearal) [1] was a proposed reform of the Gregorian calendar designed by Moses B. Cotsworth, first presented in 1902. [2] The International Fixed Calendar divides the year into 13 months of 28 days each.

  4. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...

  5. What’s the point of a Leap Year? Why 2024 brings 29 days of ...

    www.aol.com/point-leap-why-2024-brings-192452163...

    The rule is that if the year is divisible by 100 and not divisible by 400, the leap year is skipped. The year 2000 was a leap year, for example, but the years 1700, 1800, and 1900 were not.

  6. Category:Months in the 1900s - Wikipedia

    en.wikipedia.org/wiki/Category:Months_in_the_1900s

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us

  7. Solar cycle (calendar) - Wikipedia

    en.wikipedia.org/wiki/Solar_cycle_(calendar)

    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]

  8. Century common year - Wikipedia

    en.wikipedia.org/wiki/Century_common_year

    The years 1800 and 1900 were also century common years, and so will be 2100, 2200, 2300, 2500, 2600, 2700, 2900, and 3000. The Gregorian Calendar repeats itself every 400 years, so century common years start on a Friday if the remainder obtained when dividing the year by 400 is 100 (dominical letter C), Wednesday if the remainder is 200 ...

  9. Here’s When and Why We Get a Bonus Day in February 2024 - AOL

    www.aol.com/lifestyle/why-extra-day-february...

    February, the last month in their calendar, was designated with 28 days, while an extra day was added every four years during a leap year. This adjustment aimed to align the calendar with the ...

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