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September is the ninth month of the year in both the Gregorian calendar and the less commonly used Julian calendar. In the modern Gregorian calendar, its length is 30 days. September in the Northern Hemisphere and March in the Southern Hemisphere are seasonally equivalent.
The Gregorian calendar is the calendar used in most parts of the world. 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.
September (from Latin septem, "seven") or mensis September was originally the seventh of ten months on the ancient Roman calendar that began with March (mensis Martius, "Mars' month"). It had 29 days.
A full list of the monthly holidays and observances for September 2022, from Labor Day and Patriot Day to Grandparents Day and National Voter Registration Day.
There were four months of "31" days —March, May, Quintilis, and October—called "full months" (pleni menses) and six months of "30" days —April, June, Sextilis, September, November, and December—called "hollow months" (cavi menses). These "304" days made up exactly 38 nundinal cycles.
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September 2 of Julian calendar (Wednesday) (September 13 "New Style") – Great Britain and the British Empire use the Julian calendar for the last time and adopt the Gregorian calendar, making the next day Thursday, September 14 in the English-speaking world.
September. 3 September: Saint Gregory the Great, Pope and Doctor of the Church – memorial; 8 September: The Nativity of the Blessed Virgin Mary – feast; 9 September: Saint Peter Claver, Priest – optional memorial; 12 September: The Most Holy Name of Mary – optional memorial
Festivals in ancient Rome were a very important part in Roman religious life during both the Republican and Imperial eras, and one of the primary features of the Roman calendar. Feriae ("holidays" in the sense of "holy days"; singular also feriae or dies ferialis) were either public (publicae) or private ( privatae).
September 4 is the 247th day of the year (248th in leap years) in the Gregorian calendar; 118 days remain until the end of the year.