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The Gregorian calendar is the calendar used in most parts of the world. [1] [a] 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.
Wednesday, 2 September 1752, was followed by Thursday, 14 September 1752. In Great Britain, the term "New Style" was used for the calendar and the Act omits any acknowledgement of Pope Gregory: the Annexe to the Act established a computation for the date of Easter that achieved the same result as Gregory's rules, without actually referring to him.
Inter gravissimas (English: "Among the most serious...") was a papal bull issued by Pope Gregory XIII on 24 February 1582. [1] [2] The document, written in Latin, reformed the Julian calendar. The reform came to be regarded as a new calendar in its own right and came to be called the Gregorian calendar, which is used in most countries today.
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. In religious sources it could be that the Julian calendar was used for a longer period of time, in particular by Protestant and Eastern Orthodox churches. The ...
The Julian calendar was the model used by the Western world for hundreds of years. Enter Pope Gregory XIII, who calibrated further. His Gregorian calendar took effect in the late 16th century.
That Hebrew calendar is based on a combination of lunar and solar cycles. But the Gregorian calendar established by Pope Gregory XIII in 1582 defines one year by the time it takes for Earth to ...
Detail of the tomb of Pope Gregory XIII celebrating the introduction of the Gregorian calendar. Pope Gregory XIII is best known for commissioning the Gregorian calendar , initially authored by the physician/astronomer Aloysius Lilius [ 6 ] [ 7 ] and aided by Jesuit priest/astronomer Christopher Clavius , who made the final modifications.
The civil calendar is the calendar, or possibly one of several calendars, used within a country for civil, official, or administrative purposes. [1] The civil calendar is almost always used for general purposes by people and private organizations. The most widespread civil calendar and de facto international standard is the Gregorian calendar.