September (i/ˌsɛptˈɛmbər/ sep-TEM-bər) is the ninth month of the year in the Julian and Gregorian Calendars and one of four months with a length of 30 days.
September in the Northern Hemisphere is the seasonal equivalent of March in the Southern Hemisphere.
In the Northern hemisphere, the beginning of the meteorological autumn is on the 21st of September . In the Southern hemisphere, the beginning of the meteorological spring is on the 21st of September.
September begins on the same day of the week as December every year, because there are 91 days separating September and December, which is a multiple of seven (the number of days in the week). No other month ends on the same day of the week as September in any year.
In Latin, septem means "seven" and septimus means "seventh"; September was in fact the seventh month of the Roman calendar until 46 BC, when the first month changed from Kalendas Martius (1 March) to Kalendas Januarius (1 January). It is the sixth month of the Astrological calendar, which begins end of March/Mars/Aries.
September marks the beginning of the ecclesiastical year in the Eastern Orthodox Church.
Events in September 
starts in September in many countries, such as here, in Liège
It is the start of the academic year in many countries in the Northern Hemisphere.
- In Australia and NZ, Father's Day is celebrated on the first Sunday of September.
- In Australia, the Rugby League Grand Final is played on the last Sunday of September.
- In Australia, the AFL Grand Final is played on the last Saturday of September.
- In Brazil, Independence Day is celebrated September 7
- Canada/ USA - Labor Day (Labour Day in Canada) is observed on the first Monday in September in the United States and Canada.
- National Grandparents' Day takes place on the first Sunday after Labor Day in the United States and Canada.
- In Chile, Fiestas Patrias is celebrated on September 18 and September 19.
- In China, Shenyang Incident ～ 18-9-1931 Japan invades China September 18.
- The Chinese August Moon festival (more correctly called the Mid-Autumn Festival) occurs in September.
- September 1 is celebrated as the beginning of Eritrea 's 30 year armed struggle for independence from Ethiopia, which began in September 1961 and ended in May 1991.
- As a celebration for the coming October, the traditional harvest month in historic Germany, the German Oktoberfest is celebrated near the end of September.
- In India, Teachers' Day is celebrated on September 5. The date is the birthday of the second President of India, academic philosopher Dr. Sarvepalli Radhakrishnan.
- Italy - On the first Sunday of September, the regata storica parade is staged in Venice, as prelude to the rowing contests known as regattas.
- In Japan, Respect for the Aged Day is a national holiday celebrated on the third Monday of September. Autumnal Equinox Day is also a national holiday.
- In Saint Kitts and Nevis, National Heroes' Day is celebrated September 16.
- In Saint Kitts and Nevis, Independence Day is celebrated September 19.
- In Malaysia, September 16 is celebrated annually as Malaysia Day, the day Sabah, Sarawak, Singapore and Malaya come together and form Federation of Malaysia in 1963.
- In Mexico, Independence Day is celebrated September 16.
- In Mozambique, Revolution Day is celebrated on September 25.
- In the Netherlands the third Tuesday in September is known as prinsjesdag. The government presents its annual budget. The queen rides to the parliament in a gilded coach and reads the plans for the coming year to the States-general.
- Heritage Day is celebrated in South Africa on 24 September.
- In KwaZulu-Natal, king Shaka is commemorated on the last Sunday of September.
- In the United States, September is National Preparedness Month
- In the United States, Hispanic Heritage Month is celebrated from September 15 to October 15.
- California Admission Day to commemorate the admission of California into the Union is September 9.
- German American Heritage Month begins on September 15 in the United States.
- In Uzbekistan, Independence Day is celebrated September 1
- Vietnam's National Day is September 2
- In 1752, the British Empire adopted the Gregorian calendar. In the British Empire that year, September 2 was immediately followed by September 14.
- On Usenet, it is said that September 1993 (Eternal September) never ended.
- September in the Northern Hemisphere is the seasonal equivalent to March in the Southern Hemisphere and vice versa.
- The Ludi Magni (Ludi Romani) of classical Rome in honor of Jupiter, Juno and Minerva began on September 4.
- The principal ecclesiastical feasts falling within the month are: the Nativity of the Blessed Virgin on the 8th, the Exaltation of the Holy Cross on the 14th, St. Matthew the apostle on the 21st, and St. Michael the archangel on the 29th.
- September was called "harvest month" in Charlemagne's calendar.
- September corresponds partly to the Fructidor and partly to the Vendémiaire of the first French republic.
- The Anglo-Saxons called the month Gerstmonath, barley month, that crop being then usually harvested.
- September is called Herbstmonat, harvest month, in Switzerland.
- The September 11, 2001 attacks on the World Trade Center and the Pentagon.
- Prostate Cancer Awareness Month
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