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The solar calendar used in most of the world, sponsored by Pope Gregory XIII in 1582 as a corrected version of the Julian calendar. See Table at calendar.
the revision of the Julian calendar introduced in 1582 by Pope Gregory XIII and still in force, whereby the ordinary year is made to consist of 365 days and a leap year occurs in every year whose number is divisible by four, except those centenary years, such as 1900, whose numbers are not divisible by 400
the reformed Julian calendar now in use, according to which the ordinary year consists of 365 days, and a leap year of 366 days occurs in every year whose number is exactly divisible by 4 except centenary years whose numbers are not exactly divisible by 400, as 1700, 1800, and 1900.
[1640–50; after Pope Gregory XIII]
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|Noun||1.||Gregorian calendar - the solar calendar now in general use, introduced by Gregory XIII in 1582 to correct an error in the Julian calendar by suppressing 10 days, making Oct 5 be called Oct 15, and providing that only centenary years divisible by 400 should be leap years; it was adopted by Great Britain and the American colonies in 1752|
solar calendar - a calendar based on solar cycles
church calendar, ecclesiastical calendar - a calendar of the Christian year indicating the dates of fasts and festivals
Gregorian calendar month - a month in the Gregorian calendar
May - the month following April and preceding June
June - the month following May and preceding July
July - the month following June and preceding August