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  2. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  3. 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).

  4. 3rd millennium - Wikipedia

    en.wikipedia.org/wiki/3rd_millennium

    The Revised Julian Calendar, however, observes a leap year in 2900 instead; those Orthodox Churches (e.g. Greek) using the Revised Julian Calendar to calculate fixed-date feasts will, if no changes are made to the calendar before then, celebrate fixed-date feasts a day earlier than Catholic and Protestant churches from March 2800 until February ...

  5. List of years - Wikipedia

    en.wikipedia.org/wiki/List_of_years

    Main page; Contents; Current events; Random article; About Wikipedia; Contact us; Help; Learn to edit; Community portal; Recent changes; Upload file

  6. 21st century BC - Wikipedia

    en.wikipedia.org/wiki/21st_century_BC

    c. 21001900 BC: The beginning of the Middle Minoan civilization in Crete. [7] Bronze metallurgy and the potter's wheel are introduced, [8] as are Cretan hieroglyphs. [9] c. 2100–1800 BC – The Sintashta culture emerges in the northern Eurasian Steppe. [10] c. 2070 BC – Yu the Great establishes the Xia dynasty in China. [11]

  7. World Calendar - Wikipedia

    en.wikipedia.org/wiki/World_Calendar

    The quarters are equal: each has exactly 91 days, 13 weeks, or 3 months. The three months in each quarter have 31, 30, and 30 days respectively. Each quarter begins with the 31-day months of January, April, July, or October. The World Calendar also has the following two additional days to maintain the same new year days as the Gregorian calendar.

  8. 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]

  9. Doomsday rule - Wikipedia

    en.wikipedia.org/wiki/Doomsday_rule

    Since in the Gregorian calendar there are 146,097 days, or exactly 20,871 seven-day weeks, in 400 years, the anchor day repeats every four centuries. For example, the anchor day of 1700–1799 is the same as the anchor day of 2100–2199, i.e. Sunday. The full 400-year cycle of doomsdays is given in the adjacent table.

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