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This is a list of adoption dates of the Gregorian calendar by country.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.
The Julian calendar is a solar calendar of 365 days in every year with an additional leap day every fourth year (without exception). The Julian calendar is still used as a religious calendar in parts of the Eastern Orthodox Church and in parts of Oriental Orthodoxy as well as by the Amazigh people (also known as the Berbers).
The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to the dates preceding its official introduction in 1582. In nations that adopted the Gregorian calendar after its official and first introduction, dates occurring in the interim period of 15 October 1582 (the first date of use of Gregorian calendrical dates, being dated 5 October 1582 in the preceding ...
Memorial plaque to John Etty in All Saints' Church, North Street, York, recording his date of death as "28 of Jan: 170 + 8 / 9 ". In the Kingdom of Great Britain and its possessions, the Calendar (New Style) Act 1750 introduced two concurrent changes to the calendar.
The Lutheran Duchy of Prussia, until 1657 still a fiefdom of Catholic Poland, was the first Protestant state to adopt the Gregorian calendar. Under the influence of its liege lord, the King of Poland, it agreed in 1611 to do so.
Christopher Clavius, SJ (25 March 1538 – 6 February 1612 [1]) was a Jesuit German mathematician, head of mathematicians at the Collegio Romano, and astronomer who was a member of the Vatican commission that accepted the proposed calendar invented by Aloysius Lilius, that is known as the Gregorian calendar.
This article may be confusing or unclear to readers.In particular, not all reforms discussed in this article were initiated by Gregory VII. This article could be improved by a more clear and accurate chronology, equal discussion of the key figures involved (such as Pope Nicholas II), and more robust contextualization.