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  2. October - Wikipedia

    en.wikipedia.org/wiki/October

    October is the tenth month of the year in the Julian and Gregorian calendars. Its length is 31 days. Its length is 31 days. The eighth month in the old calendar of Romulus c. 750 BC , October retained its name (from Latin and Greek ôctō meaning "eight") after January and February were inserted into the calendar that had originally been ...

  3. 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 ...

  4. List of month-long observances - Wikipedia

    en.wikipedia.org/wiki/List_of_month-long_observances

    National Bike Month. National Military Appreciation Month. National Foster Care Month [ 27] National Guide Dog Month (2008, 2009) National Pet Month (United States) National Smile Month (United Kingdom, May and June) National Stroke Awareness Month. South Asian Heritage Month (Ontario, Canada) Zombie Awareness Month.

  5. Hebrew calendar - Wikipedia

    en.wikipedia.org/wiki/Hebrew_calendar

    When the difference goes above 18/19-month this signifies a leap year, and the difference is reduced by one month. The Hebrew calendar assumes that a month is uniformly of the length of an average synodic month, taken as exactly 29 13753 ⁄ 25920 days (about 29.530594 days, which is less than half a second from the modern scientific estimate ...

  6. List of environmental dates - Wikipedia

    en.wikipedia.org/wiki/List_of_environmental_dates

    09: Third Friday in September. World Cleanup Day [ 135] 09: September 16, 2023, Third Saturday in September. National Cleanup Day [ 136] 09: September 18, 2021, Third Saturday in September. International Red Panda Day [ 137] 09: Third Saturday of September. Zero Emissions Day [ 138] 09-21: September 21.

  7. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The issue spans the changeover; the date heading reads: "From Tuesday September 1, O.S. to Saturday September 16, N.S. 1752". [ 1] 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 ...

  8. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    Fifth Month (from the earlier calendar starting in March) 31 31 31 31 8. August VIII. Mensis Sextilis: Sixth Month 29 29 29 29 9. September IX. Mensis September: Seventh Month 29 29 29 29 10. October X. Mensis October: Eighth Month 31 31 31 31 11. November XI. Mensis November: Ninth Month 29 29 29 29 12. December XII. Mensis December: Tenth ...

  9. 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.

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