September is the ninth month of the year in the Julian and Gregorian calendars and the third month to have the length of 30 days. It is also the month with the longest name.
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 1 September. In the Southern hemisphere, the beginning of the meteorological spring is on 1 September.
September marks the beginning of the ecclesiastical year in the Eastern Orthodox Church. It is the start of the academic year in many countries, in which children go back to school after the summer break, sometimes on the first day of the month.
September (Roman month) (from Latin septem, "seven") was originally the seventh of ten months on the oldest known Roman calendar, with March (Latin Martius) the first month of the year until perhaps as late as 153 BC. After the calendar reform that added January and February to the beginning of the year, September became the ninth month, but retained its name. It had 29 days until the Julian reform, which added a day.
Ancient Roman observances for September include Ludi Romani, originally celebrated from September 12 to September 14, later extended to September 5 to September 19. In the last 1st century BC, an extra day was added in honor of the deified Julius Caesar on 4 September. Ludi Triumphales was held from September 18–22. The Septimontium was celebrated in September, and on December 11 on later calendars. These dates do not correspond to the modern Gregorian calendar. In 1752, the British Empire adopted the Gregorian calendar. In the British Empire that year, September 2 was immediately followed by September 14.
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. On Usenet, it is said that September 1993 (Eternal September) never ended. September is called Herbstmonat, harvest month, in Switzerland. The Anglo-Saxons called the month Gerstmonath, barley month, that crop being then usually harvested.
September in Astronomy and Astrology
Meteor showers that occur in September include the Aurigids, the Delta Aurigids which occur from mid-September to early October, the Southern Taurids, which occur from September 10 to November 20, and the Andromedids which occur from September 25-December 25.
The September equinox takes place in this month, and certain observances are organized around it. It is the Autumn equinox in the Northern Hemisphere, and the Vernal Equinox in the Southern Hemisphere. The dates can vary from 21 September to 24 September (in UTC).
September is mostly in the sixth month of the astrological calendar (and the first part of the seventh), which begins at the end of March/Mars/Aries.
September's birthstone is the sapphire.
The birth flowers for September are the forget-me-not, morning glory and aster.
The zodiac signs for the month of September are Virgo and Libra whose end and start are related to equinox date (usually 22 or 23 September).
This list does not necessarily imply either official status or general observance.
(please note that all Jewish observances, which are set by the Hebrew calendar, begin at sunset the day prior to the date listed and end on the sunset of the date in question)
September 20: Amavasya (Hinduism)
Amerindian Heritage Month (Guyana)
Childhood Cancer Awareness Month (United Kingdom)
Gynecologic Cancer Awareness Month
Leukemia and Lymphoma Awareness Month
Ovarian Cancer Awareness Month
Thyroid Cancer Awareness Month
Better Breakfast Month
Food Safety Education Month
National Childhood Obesity Awareness Month
Hydrocephalus Awareness Month
Pain Awareness Month
National Preparedness Month
National Prostate Cancer Awareness Month
National Prostate Health Month
National Sickle Cell Awareness Month
National Yoga Month
Food Months
National Bourbon Heritage Month
California Wine Month
National Chicken Month
National Honey Month
National Mushroom Month
National Papaya Month
National Potato Month
National Rice Month
National Whole Grains Month
National Wild Rice Month
Egyptian Engineering Day (Egypt): September 5–6
White Balloon Day (Australia): September 9
Sustainable House Day (Australia): September 11
Family Day (Australian Capital Territory): September 26
Ally Week (United States): September 26–30
Memorial of the Holy Guardian Angels: September 2 (Roman Catholic Church, October 2 in most locations, first Sunday in September by special dispensation)
Jeûne genevois (Geneva, Switzerland): September 8 (Thursday following the first Sunday of September)
Feast of Sts Cosmas and Damian (Italian-American): September 10–11 (weekend after Labor Day)
Racial Justice Sunday (British Churches): September 11 (second Sunday of September)
Federal Day of Thanksgiving, Repentance and Prayer: (Switzerland) - September 18 (third Sunday of September)
Lundi du Jeûne: (Vaud, Switzerland) - September 19 (Monday after third Sunday)
Saturday of Souls: September 17 (Saturday closest to Sept. 23, the Conception of Saint John the Forerunner, Russian Orthodox only)
Engineer's Days (Tanzania)
Engineer's Days (Tanzania)
Labor Day (Marshall Islands)
Teachers' Day (Singapore)
Bacon Day (United States)
Brazilian Day (International observance)
Father's Day (Australia, Fiji, New Zealand, Papua New Guinea)
Memorial of the Holy Guardian Angels (Roman Catholic Church, October 2 in most locations)
National Suicide Prevention Week (United States)
Labor Day (Canada, United States, Palau)
Administrative Professionals' Day (South Africa)
Jeûne genevois (Canton of Geneva, Switzerland)
Carl Garner Federal Lands Cleanup Day (United States)
Day of the Workers in the Oil, Gas, Power, and Geological Industry (Turkmenistan)
Celebrate Freedom Week (Kansas and Texas, United States)
First Sunday after September 4: September 11
Wakes Week (Parts of England and Scotland)
Abbots Bromley Horn Dance (Abbots Bromley, Staffordshire, England)
Second Sunday: September 11
Auditor's Day (Church of Scientology)
Father's Day (Latvia)
National Grandparents' Day (Estonia, United States)
Racial Justice Sunday (British Churches)
Tanker's Day (Russia)
Turkmen Bakhshi Day (Turkmenistan)
Nearest weekday to September 12: September 12
Saragarhi Day (Sikhism)
Weekday nearest September 17: September 16
Constitution Day (United States)
Third Friday: September 16
National POW/MIA Recognition Day (United States)
Saturday of the Third Weekend: September 17
Software Freedom Day (International observance)
Oktoberfest celebrations begin (German diaspora, International observance, third Saturday)
Von Steuben Day (United States)
Sunday of the Third Weekend: September 18
Day of the Walloon Region (Wallonia, Belgium)
Father's Day (Ukraine)
Warachikuy (Cusco, Peru)
Tolkien Week
Bisexual Awareness Week
National Forest Week (Canada)
National Tree Day (Wednesday of last full week): September 21
Celebrate Freedom Week (Arkansas and Florida, United States)
Third Monday: September 19
Respect for the Aged Day (Japan)
Third Tuesday: September 20
Prinsjesdag (Netherlands)
Observances pertaining to the September Equinox: September 22
Autumnal Equinox Day (Japan)
Guldize (Cornish people)
Higan (Japan)
Mabon (Neopaganism, Northern Hemisphere)
Miķeļi (Latvia)
Ostara (Neopaganism, Southern Hemisphere)
Fourth Friday: September 23
Native American Day (California, United States)
Last Saturday: September 24
National Public Lands Day (United States)
Gold Star Mother's Day (United States)
American Indian Day (Tennessee, United States)
September Declaration (Flanders, Belgium)
Banned Books Week (United States)
Manit Day (Marshall Islands)
Ask a Stupid Question Day (India, United Kingdom, United States)
September 1
Anniversary of the Start of the Armed Struggle (Eritrea)
Constitution Day (Slovakia)
Disaster Prevention Day (Japan)
Emma Nutt Day (International observance)
First day of school in many countries in Asia, Europe and the Americas.
Flag Day (Honduras)
Independence Day (Uzbekistan)
Journalist Day (Taiwan)
Knowledge Day (Russia)
Random Acts of Kindness Day (New Zealand)
Start of National Arbor Week (South Africa), September 1–7
Teachers' Day (Singapore)
Wattle Day (Australia)
September 2
Independence Day (Transnistria, unrecognized)
Independence Day (, unrecognized)
National Day (Vietnam)
Sedantag (German Empire, defunct)
Victory over Japan Day (United States)
September 3
China's victory over Japan commemoration related observances:
Armed Forces Day (Republic of China)
V-J Day (People's Republic of China)
Feast of San Marino and the Republic, celebrates the foundation of the Republic of in 301.
Flag Day (Australia)
Independence Day (Qatar)
Levy Mwanawasa Day (Zambia)
Memorial Day (Tunisia)
Merchant Navy Remembrance Day (Canada)
Merchant Navy (United Kingdom)
September 4
Clear Day (Scientology)
Immigrant's Day (Argentina)
National Macadamia Nut Day (United States)
Newspaper Carrier Day (United States)
September 5
International Day of Charity
National Cheese Pizza Day (United States)
Teachers' Day (India)
September 6
Armed Forces Day (São Tomé and Príncipe)
Defence Day or Army Day (Pakistan)
Flag Day (Bonaire)
Independence Day (Swaziland)
National Coffee Ice Cream Day (United States)
Unification Day (Bulgaria)
September 7
Air Force Day (Pakistan)
Independence Day (Brazil)
Military Intelligence Day (Ukraine)
National Threatened Species Day (Australia)
Victory Day (Mozambique)
September 8
Day of the Battle of Borodino (Russia)
Feast Day of Our Lady of Meritxell (national holiday in Andorra)
Feast of 'Izzat (Might), only if Bahá'í Naw-Rúz falls on March 21, which it does for 2015 (Bahá'í Faith)
Independence Day (Republic of Macedonia)
International Literacy Day
Martyrs' Day (Afghanistan) (date may fall on September 9, follows a non-Gregorian calendar)
National day (Andorra)
Nativity of Mary (Roman Catholic Church), (Anglo-Catholicism)
Monti Fest (Mangalorean Catholic)
Victory Day (Pakistan)
Victory Day (Malta)
World Physical Therapy Day
September 9
Armored Forces Day (Ukraine)
California Admission Day (California, United States)
Children's Day (Costa Rica)
Chrysanthemum Day (Japan)
Day of the Victims of Holocaust and of Racial Violence (Slovakia)
Independence Day or Republic Day (North Korea)
Independence Day (Tajikistan) from USSR in 1991.
Martyrs' Day (Afghanistan) (date may fall on September 8, follows a non-Gregorian calendar)
National Steak Au Poivre Day (United States)
Remembrance for Herman the Cheruscan (The Troth)
Wienerschnitzel Day (United States)
Wonderful Weirdos Day
September 10
Amerindian Heritage Day (Guyana)
Children's Day (Honduras)
National Day (Gibraltar)
Saint George's Caye Day (Belize)
Teachers' Day (China)
World Suicide Prevention Day
September 11
Battle of Tendra Day (Russia)
Death Anniversary of Quaid-e-Azam Muhammad Ali Jinnah, a former holiday. (Pakistan)
Emergency Number Day (United States)
Enkutatash falls on this day if it is not a leap year.(Ethiopia, Rastafari)
National Day of Catalonia (Catalonia)
National Hot Cross Bun Day (United States)
Nayrouz (Coptic Orthodox Church)
Patriot Day (United States)
Remember Freedom Day
Teachers' Day (Argentina)
September 12
Day of Conception (Russia)
Day of the Programmer, during a leap year. (International)
Defenders Day (Maryland. (United States)
Enkutatash falls on this day if it is a leap year. (Ethiopia, Rastafari)
Mindfulness Day
National Chocolate Milkshake Day (United States)
National Day (Cape Verde)
National Day of Encouragement (United States)
Saragarhi Day (Sikhism) (this day or nearest weekday, 2015 date: September 11)
September 13
Day of the Programmer, during a non-leap year. (International)
Feast of the Cross (Assyrian Church of the East)
Día de los Niños Héroes (Mexico)
Engineer's Day (Mauritius)
Epulum Jovis, celebrated on the Ides of September, during the Ludi Romani. (Roman Empire)
International Chocolate Day
September 14
Children's Day (Nepal) (celebrated on the 15th on leap years)
Engineer's Day (Romania)
Feast of the Cross (Christianity)
Elevation of the Holy Cross (Eastern Orthodox)
Hindi Diwas (Hindi-speaking regions)
Mobilized Servicemen Day (Ukraine)
National Eat a Hoagie Day (United States)
San Jacinto Day (Nicaragua)
September 15
Battle of Britain Day (United Kingdom)
Children's Day (Nepal) (leap years only)
Engineer's Day (India)
Free Money Day (International)
Independence Day (Guatemala, El Salvador, Honduras, Nicaragua, and Costa Rica)
International Day of Democracy (International)
Knowledge Day (Azerbaijan)
Patriotic Day (Guatemala)
Restoration of Primorska to the Motherland Day (Slovenia)
Silpa Bhirasri Day (Thailand).
World Lymphoma Awareness Day (International)
The beginning of National Hispanic Heritage Month, celebrated until October 15 (United States)
September 16
Grito de Dolores (Mexico)
Independence Day (Papua New Guinea), celebrates the independence of Papua New Guinea from Australia in 1975.
International Day for the Preservation of the Ozone Layer
Malaysian Armed Forces Day (Malaysia)
Malaysia Day (Malaysia, Singapore)
Martyrs' Day (Libya)
Heroes' Day (Saint Kitts and Nevis)
National Guacamole Day (United States)
Stay Away from Seattle Day
September 17
Australian Citizenship Day
Constitution Day (United States) (observed on the previous Friday if it falls on a Saturday, the following Monday if on a Sunday)
Start of Constitution Week, runs from September 17–23
Heroes' Day (Angola)
Marathwada Liberation Day (India)
National Apple Dumpling Day (United States)
Operation Market Garden Anniversary is still remembered with parachuting and dedications on this day. (Netherlands)
Teachers' Day (Honduras)
Von Steuben Day. (United States), weekend of the week of September 17.
September 18
Day of National Music (Azerbaijan)
First day of Fiestas Patrias (Chile) or Dieciocho (Chile)
Island Language Day (Okinawa Prefecture, Japan)
Ludi Triumphales (Ancient Rome) (September 19–22)
Navy Day (Croatia)
World Water Monitoring Day (International)
September 19
Armed Forces Day (Chile)
Day of the First Public Appearance of the Slovak National Council
Feast of San Gennaro
Second day of Fiestas Patrias (Chile)
Independence Day, (Saint Kitts and Nevis)
International Talk Like a Pirate Day
September 20
Independence Day of South Ossetia (not fully recognized)
National Youth Day (Thailand)
Oil Workers' Day (Azerbaijan)
Universal Children's Day (Germany)
September 21
September 22
September 23
Celebrate Bisexuality Day
September equinox (2015 date)
September 24
Heritage Day (South Africa)
September 25
Revolution Day (Mozambique)
September 26
September 27
September 28
September 29
National Coffee Day (multiple countries, see article)
Inventors' Day (Argentina)
Michaelmas One of the four quarter days in the Irish calendar. (England and Ireland)
Victory of Boquerón Day (Paraguay)
World Heart Day
September 30
