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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. 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 ...

  4. 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).

  5. 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]

  6. Perfect month - Wikipedia

    en.wikipedia.org/wiki/Perfect_month

    Due to calculation rules, the years 1700, 1800, and 1900 are not leap years, causing a shift in the sequence with a spacing of twelve years between 1698 and 1710, 1795 and 1807, and 1897 and 1909 respectively; however 2094, 2100 and 2106 will all feature perfect months with spacings of six years on Monday-first calendars.

  7. Calendar reform - Wikipedia

    en.wikipedia.org/wiki/Calendar_reform

    Some calendars have quarters of regularly patterned uneven months e.g., a 35-day (five-week) month and a pair of 28-day (four-week) months, with a leap week appended to the final month when needed. The Common Civil Calendar and Time calendar has months of 30 and 31 days, but inserts a leap week in the middle of the year, when needed, whereas ...

  8. This Is the Word of the Year for 2021 - AOL

    www.aol.com/lifestyle/word-2021-151731926.html

    The post This Is the Word of the Year for 2021 appeared first on Reader's Digest. Skip to main content. 24/7 Help. For premium support please call: 800-290-4726 more ways to reach us ...

  9. 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]

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