Wikipedia:Selected anniversaries/April 23
This is a list of selected April 23 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 April 23, 2018 featured article or the April 23, 2018 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.
Use only ONE image at a time
Hall of the Grand National Assembly of Turkey
The Golden Dome at the University of Notre Dame, built following the 1879 fire
|World Book Day;||refimprove|
|National Sovereignty and Children's Day in Turkey||refimprove|
|Saint George's Day in various countries;||refimprove|
|1348 – The first-ever appointments to the Order of the Garter, an order of chivalry founded by King Edward III of England, were announced.||refimprove section|
|1827 – Irish mathematician and physicist William Rowan Hamilton presented his Theory of Systems of Rays.||refimprove section, unreferenced section|
|1920 – The Grand National Assembly of Turkey, the Turkish unicameral parliament, was founded in Ankara in the midst of the Turkish War of Independence.||refimprove section|
|1923 – Gdynia was inaugurated as a Polish seaport on the coast of Gdańsk Bay, a southwestern bay of the Baltic Sea.||refimprove section, expansion|
|1935 – Poland adopted a new constitution, introducing a presidential system with certain elements of authoritarianism.||Stubby, no footnotes|
|1961 – In the midst of the Algerian War, French President Charles de Gaulle delivered a televised speech calling on military personnel and civilians to oppose a coup d'état attempt against him.||refimprove section|
|1968 – Students protesting the Vietnam War at Columbia University in New York City took over administration buildings and shut down the university.||neutrality issues, refimprove section|
|1982 – The city of Key West, Florida, facetiously declared independence from the United States to protest a United States Border Patrol roadblock and inspection point along U.S. Route 1, the main road into the city.||refimprove|
|1985 – The Coca-Cola Company replaced its flagship soft drink, Coca-Cola, with "New Coke", which generated so much negative response that the company put the previous formula back on the market less than three months later.||inappropriate tone|
- 1016 – Edmund Ironside became King of England, reigning for only seven months before the country was conquered by Cnut the Great.
- 1661 – Charles II, King of England, Ireland, and Scotland was crowned at Westminster Abbey.
- 1918 – First World War: The British Royal Navy conducted a raid on the Belgian port of Bruges-Zeebrugge.
- 1951 – American journalist William N. Oatis was arrested for espionage by the Communist government of Czechoslovakia.
- 1979 – Activist Blair Peach suffered fatal head injuries when he was knocked unconscious during an Anti-Nazi League demonstration in Southall, London, against a National Front election meeting in the town hall.
- 2010 – Governor of Arizona Jan Brewer signed the controversial anti-illegal immigration bill SB 1070 into law.
- Born/died this day: Kathy Lynch (b. 1957)
- 1014 – Irish forces led by Brian Boru clashed with the Vikings in the Battle of Clontarf.
- 1516 – The most well-known version of the Reinheitsgebot, the German Beer Purity Law, was adopted across the entirety of Bavaria.
- 1879 - A great fire destroys the main building of the University of Notre Dame, prompting reconstruction of the current Main Building and its golden dome.
- 1942 – Second World War: In retaliation for the Royal Air Force bombing of Lübeck several weeks prior, the Luftwaffe began a series of bombing raids in England, starting with Exeter.
- 1954 – Batting against Vic Raschi of the St. Louis Cardinals, Hank Aaron (pictured) of the Milwaukee Braves hit the first of his record-setting 755 home runs in Major League Baseball.
- 2009 – Gamma-ray burst GRB 090423 was detected, coming from the most distant known astronomical object of any kind at the time.