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The Gregorian calendar is the calendar 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.
After years of consultation and research, Pope Gregory XIII signed a papal bull in February 1582 promulgating the reformed calendar that came to be known as the Gregorian calendar. The reforms were based on the suggestions of the Italian scientist Luigi Lilio, with some modifications by the Jesuit mathematician and astronomer Christopher Clavius.
- The Editors of Encyclopaedia Britannica
This is a list of adoption dates of the Gregorian calendar by country. For explanation, see the article about the Gregorian calendar . Except where stated otherwise, the transition was a move by the civil authorities from the Julian to the Gregorian calendar.
FlagPresent CountryHistoric AreaYearAlbania191214 Nov191817 AprBrixen, Salzburg, Tyrol15835 OctAustria15846 Jan17 de abr. de 2024 · What is the Gregorian calendar? Why was the Gregorian calendar created? When was the Gregorian calendar adopted? Gregorian calendar, solar dating system now in general use. It was proclaimed in 1582 by Pope Gregory XIII as a reform of the Julian calendar. What is Leap Day? An extra day is added to the calendar about every four years. Why?
- The Editors of Encyclopaedia Britannica
- The Gregorian calendar is a solar dating system used by most of the world. It is named for Pope Gregory XIII, who issued the papal bull Inter gravi...
- Although the Julian calendar was the dominant European dating system for more than 1,600 years, its solar year measurements (365.25 days versus the...
- The Gregorian calendar was adopted by much of Catholic Europe in 1582, as directed by Pope Gregory XIII in the papal bull Inter gravissimas, which...
The Gregorian calendar reform also dealt with the accumulated difference between these figures, between the years 325 and 1582, by skipping 10 days to set the ecclesiastical date of the equinox to be 21 March, the median date of its occurrence at the time of the First Council of Nicea in 325.
The new calendar, although controversial among technical astronomers, was promulgated from Rome and adopted immediately in Catholic countries. Protestant countries followed suit more slowly. Protestant regions in Germany, and the northern Netherlands adopted the calendar within decades.
The Gregorian Calendar. By Vigdis Hocken. The Gregorian calendar is today's internationally accepted civil calendar and is also known as the Western or Christian calendar. The Vatican, 'birthplace' of the Gregorian calendar. ©iStockphoto.com/Antonio Gravante. Go to Calendar. 12 Irregular Months.
