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Gregorian calendar

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Gregorian calendar

internationally accepted civil calendar, first used in 1582

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About Gregorian calendar

The Gregorian calendar is the calendar currently used in most parts of the world. It went into effect in October 1582 following the papal bull Inter gravissimas issued by Pope Gregory XIII, which introduced it as a modification of, and replacement for, the Julian calendar. The principal change was to space leap years slightly differently to make the average calendar year 365+97⁄400, or 365.2425, days long rather than the Julian calendar's 365+1⁄4 days, thus more closely approximating the 365.2422-day tropical, or solar, year that is determined by the Earth's revolution around the Sun.

Facts from Wikidata (CC0). Image by Karl Nimtsch via Wikimedia Commons (CC BY-SA 3.0).

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Inception: October 15, 1582, October 15, 1582, December 20, 1582, 1582

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