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Why was the Gregorian calendar established?
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.
- Julian Calendar
The Julian calendar is a solar calendar of 365 days in every...
- Adoption of the Gregorian calendar
The Gregorian calendar was decreed in 1582 by the papal bull...
- Julian Calendar
Apr 17, 2024 · 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. The Gregorian calendar differs from the Julian only in that no century year is a leap year unless it is exactly divisible by 400 (e.g., 2000).
- 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 is the most widely used calendar in the world today. It was introduced in 1582 as a reform of the Julian calendar and is based on a 365-day year with leap years every four years.
Learn how Pope Gregory XIII introduced the Gregorian calendar in 1582 to fix the error of the Julian calendar and how 10 days were dropped from October. Find out which countries adopted the new calendar and when.
- The Editors of Encyclopaedia Britannica
Mar 6, 2017 · The Gregorian calendar was introduced by Pope Gregory XIII in 1582 to correct the errors of the Julian calendar. It was adopted by different countries at different times, and some countries skipped some leap years to avoid confusion.
When the Gregorian calendar firmly established January 1 as the beginning of its year, it was widely referred to as the New Style calendar, with the Julian the Old Style calendar. In Britain, under the Julian calendar, the year had first begun on December 25 and then, from the 14th century onward, on March 25.
