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Within these tables, January 1 is always the first day of the year. The Gregorian calendar did not exist before October 15, 1582. ... 1900 and 2100 but not 2000).
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The need to correct the calendar arose from the realisation that the correct figure for the number of days in a year is not 365.25 (365 days 6 hours) as assumed by the Julian calendar but slightly less (c. 365.242 days). The Julian calendar therefore has too many leap years.
See calendar and list of calendars for other groupings of years. See history, history by period, and periodization for different organizations of historical events. For earlier time periods, see Timeline of the Big Bang, Geologic time scale, Timeline of evolution, and Logarithmic timeline
1900 was an exceptional common year starting on Monday of the Gregorian calendar and a leap year starting on Saturday of the Julian calendar, the 1900th year of the Common Era (CE) and Anno Domini (AD) designations, the 900th year of the 2nd millennium, the 100th and last year of the 19th century, and the 1st year of the 1900s decade. As of the ...
Invariable Calendar: solar: Gregorian: 1900 — Gregorian calendar with four 91-day quarters of 13 weeks International Fixed Calendar: solar: Gregorian: 1902 — A "perpetual calendar" with a year of 13 months of 28 days each. Minguo calendar: solar: Gregorian: 1912: Republic of China: Months and days use the Gregorian calendar, introduced in ...
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.
For example, the years 1700, 1800, and 1900 are not leap years, but the year 2000 is. ... Although the calendar year currently runs from 1 January to 31 December, ...