September is the ninth month of the year in the Gregorian Calendar and one of four Gregorian months with 30 days.
In Latin, septem means "seven" and septimus means "seventh"; September was in fact the seventh month of the Roman calendar until 153 BC, when there was a calendar reform from the month of the Ides of March to the Kalends, or January 1.[1]
September marks the beginning of the ecclesiastical year in the Eastern Orthodox Church.[citation needed] 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 amount of days in the week)Events in September

September, from the Très riches heures du duc de Berry

School starts in September in many countries, such as here, in Belgium (here is a photograph of the first school day in a school in Liège)
It is the start of the academic year in many countries in the Northern Hemisphere.
On the first Sunday of September, the regata storica parade is staged in Venice, as prelude to the rowing contests known as regattas.[citation needed]
Labor Day (Labour Day in Canada) is observed on the first Monday in September in the United States and Canada.
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.[citation needed]
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 the United States, Hispanic Heritage Month is celebrated from September 15 to October 15.[2]
Peter Brock and Steve Irwin, two prominent Australians, both died in September.
In Mexico, Independence Day is celebrated September 15.[3]
In Brazil, Independence Day is celebrated September 7
In Saint Kitts and Nevis, National Heroes' Day is celebrated September 16.[4]
In Saint Kitts and Nevis, Independence Day is celebrated September 19.[5]
In Chile, Independence Day is celebrated September 18
National Grandparents' Day takes place on the first Sunday after Labor Day in the United States and Canada [6].
In the United States, September 11 is Patriot Day, in remembrance of the terrorist attacks on September 11, 2001.[7][8]
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.[citation needed]
The equinox named the autumnal equinox in the northern hemisphere and the vernal or spring equinox in the southern hemisphere occurs on dates varying from 21 September to 24 September (in UTC). In the pagan wheel of the year the spring equinox is the time of Ostara and the autumn equinox is that of Mabon.[citation needed]
In KwaZulu-Natal, king Shaka is commemorated on the last Sunday of September.[citation needed]
Counterintuitively, the German Oktoberfest and the Chinese August Moon festival (more correctly called the Mid-Autumn Festival) both occur in September.
In New Zealand , Father's Day is celebrated on the first Sunday of September.[citation needed]
In Australia, Father's Day is celebrated on the first Sunday of September.[citation needed]
In Australia, the Rugby League Grand Final is played on the last Sunday of September.[citation needed]
In Australia, the AFL Grand Final is played on the last Saturday of September.[citation needed]
September 1 is celebrated as the beginning of Eritrea's 30 year armed struggle for independence from Ethiopia, which began in September of 1961 and ended in May of 1991. .