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  1. Gregorian calendar - Wikipedia

    en.wikipedia.org › wiki › Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  2. Gregorian calendar - Simple English Wikipedia, the free ...

    simple.wikipedia.org › wiki › Gregorian_calendar

    From Simple English Wikipedia, the free encyclopedia The Gregorian calendar is the calendar that is used throughout most of the world. It began being used in 1582. It replaced the previous Julian calendar because the Julian calendar had an error: it added a leap year (with an extra day every four years) with no exceptions.

  3. Adoption of the Gregorian calendar - Wikipedia

    en.wikipedia.org › wiki › Adoption_of_the_Gregorian

    The Gregorian calendar was decreed in 1582 by the papal bull Inter gravissimas by Pope Gregory XIII, to correct the erroneous assumption in the then-current Julian calendar that a year lasts 365.25 days, when in reality it is about 365.2422 days.

  4. Proleptic Gregorian calendar - Wikipedia

    en.wikipedia.org › wiki › Proleptic_Gregorian_calendar

    From Wikipedia, the free encyclopedia The proleptic Gregorian calendar is produced by extending the Gregorian calendar backward to the dates preceding its official introduction in 1582.

    Julian Range
    Proleptic Gregorian Range
    Gregorian Ahead By:
    From 3 March AD 4 (beginning of quadrennial leap years) to 1 March 100
    From 1 March AD 4 to 28 February 100
    −2 days
    From 2 March 100 to 29 February 200
    From 1 March 100 to 28 February 200
    −1 day
    From 1 March 200 to 28 February 300
    From 1 March 200 to 28 February 300
    0 days
    From 29 February 300 to 27 February 500
    From 1 March 300 to 28 February 500
    1 day
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  6. Gregorian calendar - Wikipedia

    sco.wikipedia.org › wiki › Gregorian_calendar

    The Gregorian calendar is the internationally takken ceevil calendar. It wis brocht in bi Pape Gregory XIII, wha its named efter, bi a decree pennit on the 24t o Februar 1582, a papal bull kent 'fore the 1t letters Inter gravissimas. The Julian calendar is awmaist identical tha same year but the Julian calendar is o 11 minets minised.

  7. Calendar - Wikipedia

    en.wikipedia.org › wiki › Calendar

    The Gregorian calendar is the de facto international standard and is used almost everywhere in the world for civil purposes. The widely used solar aspect is a cycle of leap days in a 400-year cycle designed to keep the duration of the year aligned with the solar year.

  8. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org › wiki › Conversion_between_Julian

    The Gregorian calendar did not exist before October 15, 1582. Gregorian dates before that are proleptic, that is, using the Gregorian rules to reckon backward from October 15, 1582. Years are given in astronomical year numbering. Augustus corrected errors in the observance of leap years by omitting leap days until AD 8.

  9. Calendar era - Wikipedia

    en.wikipedia.org › wiki › Calendar_era

    A calendar era is the period of time elapsed since one epoch of a calendar and, if it exists, before the next one. For example, the Gregorian calendar numbers its years in the Western Christian era (the Coptic Orthodox and Ethiopian Orthodox churches have their own Christian eras).

  10. Calendarul gregorian - Wikipedia

    ro.wikipedia.org › wiki › Calendarul_gregorian

    Calendarul gregorian este varianta de calendar cu cea mai mare răspândire. Este o modificare a calendarului iulian anterior, în conformitate cu propunerea medicului și astronomului calabrez Luigi Lilio, care a participat la comisia prezidată de profesorul astronom iezuit Christophorus Clavius, de la Colegiul Roman, împreună cu matematicianul și astronomul sicilian Giuseppe Scala și ...

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