Wikipedia:Selected anniversaries/September 20
This is a list of selected September 20 anniversaries that appear in the "On this day" section of the Main Page. To suggest a new item, in most cases, you can be bold and edit this page. Please read the selected anniversaries guidelines before making your edit. However, if your addition might be controversial or on a day that is or will soon be on the Main Page, please post your suggestion on the talk page instead.
Please note that the events listed on the Main Page are chosen based more on relative article quality and to maintain a mix of topics, not based solely on how important or significant their subjects are. Only four to five events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is generally not posted this year if it is also the subject of the scheduled featured article or picture of the day.
To report an error when this appears on the Main Page, see Main Page errors. Please remember that this list defers to the supporting articles, so it is best to achieve consensus and make any necessary changes there first.
Images
Use only ONE image at a time
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Bobby Riggs
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Battle of Alma
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Battle of Alma
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Satellite image of Hurricane Irene–Olivia -
Pope Urban VI -
RMS Mauretania -
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Ineligible
| Blurb | Reason |
|---|---|
| Prinsjesdag in Netherlands (2011); | refimprove |
| Feast day of the Korean Martyrs (Roman Catholic Church) | lead too short |
| 1378 – Papal Schism: Unhappy with Pope Urban VI, a group of cardinals started a rival papacy with the election of Antipope Clement VII, throwing the Roman Catholic Church into turmoil. | refimprove |
| 1596 – An expedition of twelve families led by Diego de Montemayor founded Monterrey in New Spain. | Tagged for cleanup, expansion |
| 1697 – The Treaty of Ryswick was signed between France and the Grand Alliance, ending the Nine Years' War. | refimprove |
| 1848 – The American Association for the Advancement of Science, publisher of the journal Science, was founded. | refimprove section, external links |
| 1854 – The Crimean War began with a Franco-British victory over Russian forces at the Battle of Alma near the River Alma in Crimea. | refimprove |
| 1870 – The Bersaglieri entered Rome through the Porta Pia, ending the temporal power of the Pope and completing the unification of Italy. | refimprove section |
| 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". | Tagged with {{refimprove}} |
| 1979 – Jean-Bédel Bokassa, ruler of the Central African Republic, was ousted in a coup d'état backed by the French government. | refimprove |
Eligible
- 1260 – The second of two major Prussian uprisings by the Prussian tribe of Balts began against the Teutonic Knights.
- 1498 – A tsunami caused by the Meiō Nankaidō earthquake washed away the building housing the statue of the Great Buddha at Kōtoku-in in Kamakura, Japan.
- 1943 – World War II: Australian troops defeated Imperial Japanese forces at the Battle of Kaiapit in New Guinea.
- 1967 – Scientology founder L. Ron Hubbard publicly announced the story of Xenu in a taped lecture sent to all Scientologists.
- 1977 – A series of celestial phenomena of unknown nature was observed in the western Soviet Union, Finland and Denmark.
- 1984 – The Cosby Show, which became one of three US television shows to have the highest ratings five years in a row, aired its pilot episode.
- 2008 – An explosive-laden truck detonated in front of the Marriott hotel in Islamabad, Pakistan, killing 54 people and injuring 266 others.
- 2011 – The United States ended its "don't ask, don't tell" policy, allowing gays and lesbians to openly serve in the military.
September 20: Eid al-Ghadeer in Iran and Iraq (2016)
- 1066 – King Harald III of Norway and Tostig Godwinson, his English ally, fought and defeated the Northern Earls Edwin and Morcar in the Battle of Fulford near York, England.
- 1792 – The French Army achieved its first major victory in the War of the First Coalition at the Battle of Valmy.
- 1906 – The ocean liner RMS Mauretania (pictured), the largest and fastest ship in the world at the time, was launched.
- 1971 – Hurricane Irene moved west from Nicaragua, and crossed from the Atlantic Ocean into the Pacific, the first known tropical cyclone to do so.
- 2001 – During a televised address to a joint session of the United States Congress, U.S. President George W. Bush declared a "war on terror" against Al-Qaeda and other global terrorist groups.