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  2. List of adoption dates of the Gregorian calendar by country

    en.wikipedia.org/wiki/List_of_adoption_dates_of...

    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.

  3. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_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).

  4. Proleptic Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Proleptic_Gregorian_calendar

    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 ...

  5. Adoption of the Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Adoption_of_the_Gregorian...

    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.

  6. Perpetual calendar - Wikipedia

    en.wikipedia.org/wiki/Perpetual_calendar

    Breguet classique Grand complication perpetual calendar. Offices and retail establishments often display devices containing a set of elements to form all possible numbers from 1 through 31, as well as the names/abbreviations for the months and the days of the week, to show the current date for convenience of people who might be signing and dating documents such as checks.

  7. Aztec calendar - Wikipedia

    en.wikipedia.org/wiki/Aztec_calendar

    The Aztec sun stone and a depiction of its base. The Aztec or Mexica calendar is the calendrical system used by the Aztecs as well as other Pre-Columbian peoples of central Mexico.

  8. Christopher Clavius - Wikipedia

    en.wikipedia.org/wiki/Christopher_Clavius

    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.

  9. Julio - Wikipedia

    en.wikipedia.org/wiki/Julio

    Julio is the Spanish equivalent of the month July and may refer to: Julio (given name) Julio (surname) Júlio de Castilhos, a municipality of the western part of the state of Rio Grande do Sul, Brazil; Julio, a 1983 compilation album by Julio Iglesias; Julio, a character in Romiette and Julio by Sharon M. Draper