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The adoption of the Gregorian Calendar was an event in the early modern history of most cultures and societies, marking a change from their traditional (or "old style") dating system to the modern (or "new style") dating system – the Gregorian calendar – that is widely used around the world today.
- Gregorian calendar - Wikipedia
During the period between 1582, when the first countries...
- List of adoption dates of the Gregorian calendar by country
This is a list of adoption dates of the Gregorian calendar...
- Gregorian calendar - Simple English Wikipedia, the free ...
Adoption. The Pope's instruction only applied to the...
- Gregorian calendar - Wikipedia
17 de abr. de 2024 · 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 was published in February of that year. Protestant and Eastern Orthodox countries initially refused to abide by the new calendar, and the reformed system was foreign to countries outside ...
- The Editors of Encyclopaedia Britannica
- What is the Gregorian calendar?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...
- Why was the Gregorian calendar created?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...
— United States Naval Observatory. There were two reasons to establish the Gregorian calendar. First, the Julian calendar assumed incorrectly that the average solar year is exactly 365.25 days long, an overestimate of a little under one day per century, and thus has a leap year every four years without exception.
Eventually, non-Catholic countries did begin to adopt the Gregorian calendar. The Protestant regions of Germany and the Netherlands switched in the 17th century. Great Britain and the territories of the British Empire followed suit in 1752, spreading the Gregorian calendar around the globe.
