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  2. Inter gravissimas - Wikipedia

    en.wikipedia.org/wiki/Inter_gravissimas

    The first page of the papal bull Inter Gravissimas. 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.

  3. 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.

  4. Calendar reform - Wikipedia

    en.wikipedia.org/wiki/Calendar_reform

    The Gregorian calendar is currently used by most of the world. There is also an international standard describing the calendar, ISO 8601, with some differences from traditional conceptions in many cultures. Since the papal reform in 1582, several proposals have been offered to make the Gregorian calendar more useful or regular.

  5. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    [6] [d] (Scotland had already made this aspect of the changes, on 1 January 1600.) [7] [8] The second (in effect [e]) adopted the Gregorian calendar in place of the Julian calendar. Thus "New Style" can refer to the start-of-year adjustment, to the adoption of the Gregorian calendar, or to the combination of the two. It was through their use in ...

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

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

    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 ...

  7. List of date formats by country - Wikipedia

    en.wikipedia.org/wiki/List_of_date_formats_by...

    Short format: yyyy/mm/dd [80] in Persian Calendar system ("yy/m/d" is a common alternative). Gregorian dates follow the same rules in Persian literature but tend to be written in the dd/mm/yyyy format in official English documents. [81] Long format: YYYY MMMM D (Day first, full month name, and year in right-to-left writing direction) [80] Iraq ...

  8. Gregorian reform of the calendar - Wikipedia

    en.wikipedia.org/?title=Gregorian_reform_of_the...

    Language links are at the top of the page across from the title.

  9. Epact - Wikipedia

    en.wikipedia.org/wiki/Epact

    With the Gregorian reform of the calendar in 1582, two additional epacts came into use. The first was the Lilian epact, developed by Aloisius Lilius as an element of the ecclesiastical computations using the Gregorian calendar. The Lilian epact included corrections for the motions of the Sun and the Moon that broke the fixed relationship ...