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September 30 is the 273rd day of the year (274th in leap years) in the Gregorian calendar; 92 days remain until the end of the year. Events. Pre-1600 489 ...
Thirty Days Hath September", or "Thirty Days Has September", [1] is a traditional verse mnemonic used to remember the number of days in the months of the Julian and Gregorian calendars. It arose as an oral tradition and exists in many variants. It is currently earliest attested in English, but was and remains common throughout Europe as well. Full:
The principal change was to space leap years differently so as to make the average calendar year 365.2425 days long, ... September: 30 10: October: 31 11 ...
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September is the ninth month of the year in the Julian and Gregorian calendars. Its length is 30 days. September, from the Très Riches Heures du Duc de Berry. September in the Northern Hemisphere and March in the Southern Hemisphere are seasonally equivalent. In the Northern hemisphere, the beginning of the meteorological autumn is on 1 September.
The Lunar Hijri calendar ("Islamic calendar") is a lunar calendar consisting of 12 lunar months in a year of 354 or 355 days. [a] The astronomer's mean tropical year, which is averaged over equinoxes and solstices, is currently 365.24219 days, slightly shorter than the average length of the calendar year in most calendars.
A full list of the monthly holidays and observances for September 2024, from Labor Day and Patriot Day to Grandparents Day and National Voter Registration Day.
The Roman calendar began the year on 1 January, and this remained the start of the year after the Julian reform. However, even after local calendars were aligned to the Julian calendar, they started the new year on different dates. The Alexandrian calendar in Egypt started on 29 August (30 August after an Alexandrian leap year).
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