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  2. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    This resulted in scribes and scholars referring to them as "the first month", "the fifth month", etc. [citation needed] To keep the lunar year of 354 days in step with the solar year of 365.242 days an extra month was added periodically, much like a Gregorian leap year. [10] There were no weeks in the Sumerian calendar. [11]

  3. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    During the period between 1582, when the first countries adopted the Gregorian calendar, and 1923, when the last European country adopted it, it was often necessary to indicate the date of some event in both the Julian calendar and in the Gregorian calendar, for example, "10/21 February 1750/51", where the dual year accounts for some countries ...

  4. Adoption of the Gregorian calendar - Wikipedia

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

    The months and days are those of the Gregorian calendar, but the year is either the "Western calendar" (西暦, seireki) year number per the Common Era or Anno Domini system, or a year of the nengō of the emperor on the throne. Since 1873, an era and the first year of that era has begun on the day of the year that the emperor ascended the throne.

  5. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...

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

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

    Previously used the Thai lunar calendar. The year numbering followed the Rattanakosin Era until 1912, when it was replaced by the Buddhist era; see Thai solar calendar. Turkey: Ottoman Empire: 1917 15 Feb 1 Mar 13 The year numbering followed the Rumi calendar until 1 Jan 1926, when the Anno Domini era was adopted. Uganda: British Empire: 1893 ...

  7. Anno Domini - Wikipedia

    en.wikipedia.org/wiki/Anno_Domini

    The old Anno Mundi calendar theoretically commenced with the creation of the world based on information in the Old Testament. It was believed that, based on the Anno Mundi calendar, Jesus was born in the year 5500 (5500 years after the world was created) with the year 6000 of the Anno Mundi calendar marking the end of the world.

  8. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    The Gregorian calendar, introduced in 1582, corrected most of the remaining difference between the Julian calendar and the solar year. The Islamic calendar is based on the prohibition of intercalation by Muhammad, in Islamic tradition dated to a sermon given on 9 Dhu al-Hijjah AH 10 (Julian date: 6 March 632). This resulted in an observation ...

  9. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    Theoretically, 22 days were interpolated into the calendar in the second year of the four-year cycle and 23 days in the fourth. [5] This produced an excess of four days over the four years in line with the normal one day excess over one year.