Gregorian calendar - AbsoluteAstronomy.com

Overview

The Gregorian calendar, also known as the Western calendar, or Christian calendar, is the internationally accepted civil calendar

Civil calendar

In any country, the civil calendar is the calendar, or possibly one of several calendars, used within that country for civil, official or administrative purposes. The civil calendar is almost always used for general purposes by people and private organizations....

. It was introduced by Pope Gregory XIII

Pope Gregory XIII

Pope Gregory XIII , born Ugo Boncompagni, was Pope from 1572 to 1585. He is best known for commissioning and being the namesake for the Gregorian calendar, which remains the internationally-accepted civil calendar to this date.-Youth:He was born the son of Cristoforo Boncompagni and wife Angela...

, after whom the calendar was named, by a decree signed on 24 February 1582, a papal bull

Papal bull

A Papal bull is a particular type of letters patent or charter issued by a Pope of the Catholic Church. It is named after the bulla that was appended to the end in order to authenticate it....

known by its opening words Inter gravissimas
Inter gravissimas
Inter gravissimas was a papal bull issued by Pope Gregory XIII on February 24, 1582. The document reformed the Julian calendar and created a new calendar which came to be called the Gregorian calendar, which is used in most countries today.-Description:...

. The reformed calendar was adopted later that year by a handful of countries, with other countries adopting it over the following centuries.

Unanswered Questions

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Timeline

1582 Pope Gregory XIII announces the Gregorian calendar.

1582 Pope Gregory XIII implements the Gregorian Calendar. In Italy, Poland, Portugal, and Spain, October 4 of this year is followed directly by October 15.

1582 Because of the implementation of the Gregorian calendar this day does not exist in this year in Italy, Poland, Portugal and Spain.

1582 Because of the implementation of the Gregorian calendar, this day is skipped in Italy, Poland, Portugal and Spain.

1582 Because of the implementation of the Gregorian calendar this day does not exist in this year in Italy, Poland, Portugal and Spain.

1582 Because of the implementation of the Gregorian calendar, this day does not exist in this year in Italy, Poland, Portugal and Spain.

1582 Because of the implementation of the Gregorian calendar this day does not exist in this year in Italy, Poland, Portugal and Spain.

1582 Because of the implementation of the Gregorian calendar, this day does not exist in this year in Italy, Poland, Portugal and Spain.

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