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  2. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    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. The principal change was to space leap years ...

  3. Adoption of the Gregorian calendar - Wikipedia

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

    Through enactment of the Calendar (New Style) Act 1750, Great Britain and its possessions (including parts of what is now the United States) adopted the Gregorian calendar in 1752, by which time it was necessary to correct by 11 days. Wednesday, 2 September 1752, was followed by Thursday, 14 September 1752.

  4. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    Old Style (O.S.) and New Style (N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in various European countries between 1582 and 1923. In England, Wales, Ireland and Britain's American colonies, there were two calendar ...

  5. Calendar (New Style) Act 1750 - Wikipedia

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

    The Calendar (New Style) Act 1750 (24 Geo. 2. c. 23), also known as Chesterfield's Act or (in American usage) the British Calendar Act of 1751, is an Act of the Parliament of Great Britain. Its purpose was for Great Britain and the British Empire to adopt the Gregorian calendar (in effect). [c] The Act also changed the start of the legal year ...

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

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

    United States of America. Russian Empire. 1867. 6 Oct. 18 Oct. 11. Alaska adopted the Gregorian calendar on incorporation into the United States, which preceded adoption by Russia. The International Date Line was changed, so only 11 days were omitted (a Friday was followed by another Friday).

  7. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The history of calendars covers practices with ancient roots as people created and used various methods to keep track of days and larger divisions of time. Calendars commonly serve both cultural and practical purposes and are often connected to astronomy and agriculture. Archeologists have reconstructed methods of timekeeping that go back to ...

  8. Old Style 1752 - Wikipedia

    en.wikipedia.org/wiki/Old_Style_1752

    This is the calendar for Old Style 1752, a leap year which began on 1 January, and dropped 3–13 September to transition to the Gregorian calendar. [1] Previously, the Old Style calendar in England (and related regions) had begun on 25 March and ended with the following March, on 24 March. [1] Because the Gregorian calendar did not have leap ...

  9. New Year's Day - Wikipedia

    en.wikipedia.org/wiki/New_Year's_Day

    In the Gregorian calendar, New Year's Day is the first day of the calendar year, 1 January.Most solar calendars (like the Gregorian and Julian) begin the year regularly at or near the northern winter solstice, while cultures and religions that observe a lunisolar or lunar calendar celebrate their Lunar New Year at less fixed points relative to the solar year.