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  2. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    Within these tables, January 1 is always the first day of the year. 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.

  3. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    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.

  4. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    At Jefferson's birth, the difference was eleven days between the Julian and Gregorian calendars and so his birthday of 2 April in the Julian calendar is 13 April in the Gregorian calendar. Similarly, George Washington is now officially reported as having been born on 22 February 1732, rather than on 11 February 1731/32 (Julian calendar). [26]

  5. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    In other words, the Julian calendar gains 3.1 days every 400 years. Gregory's calendar reform modified the Julian rule, to reduce the average length of the calendar year from 365.25 days to 365.2425 days and thus corrected the Julian calendar's drift against the solar year: the Gregorian calendar gains just 0.1 day over 400 years. For any given ...

  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. Talk : Conversion between Julian and Gregorian calendars

    en.wikipedia.org/wiki/Talk:Conversion_between...

    I have just written in the Talk pages of Julian Calendar and of Gregorian Calendar. The current discrepancy between Gregorian and Julian calendar is 13 days, and will grow to 14 days in 2100. Notice that in 2100: Feb. 15 (Julian) is Feb. 28 (Gregorian), the 13 day difference I just wrote about. The next day: Feb. 16 (Julian) is March 1 (Gregorian).

  8. Christmas - Wikipedia

    en.wikipedia.org/wiki/Christmas

    After the Ethiopian and Eritrean insertion of a leap day in what for the Julian calendar is August (September in Gregorian), Christmas (also called Liddet or Gena, also Ledet or Genna) [209] is celebrated on Tahsas 28 in order to maintain the exact interval of nine 30-day months and 5 days of the child's gestation. [210]

  9. Calendar (New Style) Act 1750 - Wikipedia

    en.wikipedia.org/wiki/Calendar_(New_Style)_Act_1750

    The Gregorian calendar was a reform of the Julian calendar, instituted by Pope Gregory XIII in 1582 by the papal bull " Inter gravissimas" ("Among the most serious "). The intention expressed by the text of this bull was to reset the calendar so that celestial events critical for the calculation of Easter dates—the March equinox and its ...