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This is a list of selected that appears on the "On this day" section of the Main Page. To suggest a new item, in most cases you can September 20 anniversaries and edit this page. be bold Please read the However, if your addition might be controversial, or on a day that is or soon will be on the Main Page, please post your suggestion on the selected anniversaries guidelines before making your edit. talk page instead.
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Satellite image of Hurricane Irene–Olivia
in Prinsjesdag Netherlands (2011);
Feast day of the (Roman Catholic Church)
Korean Martyrs multiple issues
1378 – : Unhappy with Papal Schism Pope , a group of Urban VI cardinals started a rival papacy with the election of Antipope , throwing the Clement VII Roman Catholic Church into turmoil.
refimprove section, unreferenced section
1596 – An expedition of twelve families led by Diego de Montemayor founded in Monterrey New Spain.
Tagged for cleanup, expansion
1697 – The was signed between France and the Treaty of Ryswick Grand Alliance, ending the Nine Years' War.
1848 – The , publisher of the journal American Association for the Advancement of Science , was founded.
Science refimprove section, external links
1854 – The Crimean War began with a Franco-British victory over Russian forces at the near the Battle of the Alma River Alma in Crimea.
1870 – The Bersaglieri through the entered Rome Porta Pia, ending the temporal power of the Pope and completing the unification of Italy.
1946 – The first was held in Cannes Film Festival Cannes, France, after a seven-year delay due to World War II.
1979 – , ruler of the Jean-Bédel Bokassa Central African Republic, was ousted in a backed by the French government.
coup d'état refimprove section, unreferenced section
2001 – During a televised address to a joint session of the United States Congress, U.S. President George W. Bush declared a " " against war on terror Al-Qaeda and other global terrorist groups.
1066 – King and Harald III of Norway Tostig Godwinson, his English ally, fought and defeated the Northern Earls Edwin and Morcar in the near Battle of Fulford York, England.
1792 – The French Army achieved its first major victory in the War of the First Coalition at the . Battle of Valmy
1944 – Second World War: Allied forces San Marino from the captured German Army.
1967 – Scientology founder L. Ron Hubbard publicly announced the story of in a taped lecture sent to all Scientologists. Xenu
1971 – moved west from Nicaragua, and crossed from the Atlantic Ocean into the Pacific, the first actively tracked Hurricane Irene tropical cyclone to do so.
1973 – Billie Jean King defeated Bobby Riggs in straight sets before 30,492 spectators at the Astrodome in Houston, Texas, in an internationally televised tennis match dubbed the " ". Battle of the Sexes
1977 – A of unknown nature was observed in the western Soviet Union, Finland and Denmark. series of celestial phenomena
1984 – , which became one of three U.S. television shows to have the highest The Cosby Show ratings five years in a row, aired . its pilot episode
2011 – The United States ended its " " policy, allowing gays and lesbians to don't ask, don't tell openly serve in the military. Born/died this day: ' (b. 1861) Herbert Putnam · (b. 1894) Edith Rogers
: September 20 (Islam, 2018)
Day of Ashura
Great Buddha, Kamakura, Japan
(d. 1871) John Patteson · (b. 1885) Éva Gauthier · (b. 1942)
Rose Francine Rogombé