The Gregorian Calendar
The\xa0Gregorian calendar\xa0is the most widely used\xa0civil calendar\xa0in the world.[1][2][Note 1]\xa0It is named after\xa0Pope Gregory XIII, who introduced it in October 1582. The calendar spaces\xa0leap years\xa0to make the average year 365.2425 days long, approximating the 365.2422 day\xa0tropical year\xa0that is determined by the Earth's revolution around the Sun.\xa0
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