Wikipedia:Selected anniversaries/October 20
This is a list of selected October 20 anniversaries that appears on 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 soon will 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 5–6 events are posted at a time and thus not everything that is "most important and significant" can be listed. In addition, an event is not generally posted this year if it is also the subject of the scheduled October 20, 2017 featured article or the October 20, 2017 featured picture.
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.
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|1827 – An allied British, French, and Russian naval force destroyed a combined Ottoman and Egyptian fleet at the Battle of Navarino, a decisive moment in the Greek War of Independence.||refimprove sections|
|1883 – Peru and Chile signed the Treaty of Ancón, ending Peru's involvement in the War of the Pacific.||War featured on March 23; Treaty is unreferenced stub|
|1939 – Pope Pius XII published his first major encyclical, Summi Pontificatus, seen as setting a tone for his papacy.||lead too short|
|1991 – An urban fire killed 25 people, injured 150 others, and destroyed over 3,000 homes in the cities of Berkeley and Oakland, California.||refimprove section|
- 1740 – Under the terms of the Pragmatic Sanction of 1713, Maria Theresa assumed the throne of the Habsburg Monarchy in Austria.
- 1944 – World War II: Fulfilling a promise he made two years previously, General Douglas MacArthur landed on Leyte to begin the recapture of the entire Philippine Archipelago.
- 1951 – African-American college football player Johnny Bright was the victim of an on-field assault that eventually provoked changes in NCAA football rules and mandated the use of more protective helmets with face guards.
- 1961 – The Soviet Union performed the first armed test of a submarine-launched ballistic missile, launching an R-13 from a Golf class submarine.
- 1967 – Roger Patterson and Robert Gimlin filmed an unidentified subject at Six Rivers National Forest in California who they claimed was a Bigfoot.
- 1973 – Elizabeth II, in her capacity as Queen of Australia, formally opened the Sydney Opera House on Bennelong Point in Sydney Harbour.
- 1977 – Three members of the American rock band Lynyrd Skynyrd died when their chartered plane crashed in Gillsburg, Mississippi.
- 1982 – During a UEFA Cup match between FC Spartak Moscow and HFC Haarlem, a large number of attendees tried to leave the Grand Sports Arena of the Central Lenin Stadium at the same time, resulting in a stampede that caused 66 deaths.
- 1572 – Eighty Years' War: Soldiers of the Spanish Tercios waded across the river Scheldt at its mouth, walking overnight in water to chest height, to relieve the siege of Goes in the Spanish Netherlands.
- 1818 – The United Kingdom and the United States signed the Treaty of 1818, which settled the Canada–United States border on the 49th parallel between the Rocky Mountains and Lake of the Woods.
- 1941 – World War II: German soldiers began a massacre of thousands of civilians in Kragujevac in Nazi-occupied Serbia.
- 1986 – Aeroflot Flight 6502 crashed on approach to Kurumoch Airport in Samara (then Kuibyshev in the Soviet Union), killing 70 people on board.
- 2011 – Libyan Civil War: Muammar Gaddafi (pictured), the deposed leader of Libya, was captured during the Battle of Sirte and killed less than an hour later.