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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 ...
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).
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
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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.
Each calendar year is typically 365 days long, with the idea that it takes that many days for the Earth to make one complete rotation around the sun. ... but the years 1700, 1800, and 1900 were ...
A 50-year "pocket calendar" that is adjusted by turning the dial to place the name of the month under the current year. One can then deduce the day of the week or the date. A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future.
With the plethora of glossy calendars filled with teapots, hunky firefighters, bad cats and other ghastly topics assembled into a flimsy portfolio, you probably concur: There's never been much ...