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Editors Contribution(0.00 / 0 votes)Rate this definition: gregorian calendar. A specific type of solar calendar used on planet earth with twelves months each with a specific number of days. The Gregorian calendar is used in most countries on planet Earth, some countries use a different calendar.
The Gregorian calendar, also called the Western calendar and the Christian calendar, is internationally the most widely used civil calendar. It is named for Pope Gregory XIII, who introduced it in 1582. The calendar was a refinement to the Julian calendar amounting to a 0.002% correction in the length of the year.hen the new calendar was put in use, the error accumulated in the 13 centuries since the Council of Nicaea was corrected by a deletion of 10 days. The Julian calendar day Thursday, 4 October 1582 was followed by the first day of the Gregorian calendar, Friday, 15 October 1582 (the cycle of weekdays was not affected).