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Gregorian Calendar, calendar introduced by Pope Gregory XIII that is still in use and is a modification of the previous Roman calendar.
For information on:
- history of the calendar, see Calendar; Pope Gregory XIII
- defects in chronologies and variations in dates, see Chronology; Calendar Reform
- revolution and the Gregorian calendar, see French Republican Calendar; Russian Revolution
- calculation of particular dates on the Gregorian calendar, see New Year's Day; Hanukkah; Easter; Millennium; Bloody Sunday
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