Because the Julian calendar, which was in use then, had fallen 11 days behind the observed time. Corrections had to be made. The church was keen to ensure observed days were celebrated at the correct time.
The Gregorian calendar was an adaptation of a calendar proposed by Aloysius Lilius in 1582. However, the calendar is named after Pope Gregory XIII who introduced this calendar by a papal bull. It was a reform to the Julian calendar.
In 1582
1582
Before the introduction of the Gregorian Calendar in 1582, most of the world that now uses the Gregorian Calendar was using the Julian Calendar.
The calendar was introduced on on 24 February 1582 by Pope Gregory XIII. Further information: The Gregorian calendar was initially decreed, but not implemented, by Pope Gregory XIII on 24 February 1582. On 5 October 1582, the Gregorian calendar was adopted for the first time by Catholic countries such as Italy, Poland, Spain and Portugal. On 10 December 1582, France began using the Gregorian calendar.Non-Catholic countries such as Scotland, Britain and the latter's colonies still used the Julian calendar up until 1752, and some Asian countries were still using the Julian calendar up until the early twentieth century.
It is the year the Gregorian Calendar was introduced.
It is called the Gregorian calendar after Pope Gregory XIII and was introduced in 1582
The calendar now almost universally in use is the Gregorian calendar introduced in 1582
The Gregorian calendar was an adaptation of a calendar proposed by Aloysius Lilius in 1582. However, the calendar is named after Pope Gregory XIII who introduced this calendar by a papal bull. It was a reform to the Julian calendar.
in 1582
The calendar you are referring to is the Julian calendar, which was introduced by Julius Caesar. The Gregorian calendar, introduced by Gregory XIII in 1582, shortened the day by 10 minutes and 48 seconds. It also dropped 10 days from the years 325 to 1582.
The Gregorian calendar is the standard calendar of the "western" world. It was introduced in 1582 as a reform of the Julian calendar, which is almost identical but has 7.5 more leap year days per millennium than the Gregorian calendar, making it about 25 times less accurate.
In 1582
1582
Pope Gregor XIII introduced the calendar named after him (the Gregorian calendar) in 1582. However, some countries adopted this calendar as late as the 20th. Century.
The Gregorian calendar was named after the man who first introduced it, Pope Gregory XIII on February 1582. It is a internationally accepted civil calendar. The two other names that the calendar is called is the Western Calendar and the Christian Calendar.
The calendar commonly used in modern America is the Gregorian calendar. It was introduced by Pope Gregory XIII in 1582 and is a modification of the Julian calendar. The Gregorian calendar is widely used worldwide and is the calendar system officially followed by most countries, including the United States.