This is a list of selected April 23 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. Before doing so, please review the selected anniversaries guidelines. If your suggestion is potentially controversial or relates to a day currently or soon to appear on the Main Page, post it on the talk page instead.
Please note:
- Events listed on the Main Page are selected based on article quality and to provide a diverse range of topics, rather than solely on the importance or significance of the events.
- Only four or five events are featured each day; therefore, not all important or significant events can be included.
- An event is generally excluded if it is already the subject of the scheduled featured article, featured list or picture of the day.
To report an error in content currently on the Main Page, see Wikipedia:Main Page/Errors. If a listed event is inaccurate, please first seek consensus and update the corresponding article before making changes here.
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Hank Aaron- Hall of the Grand National Assembly of Turkey
William Rowan Hamilton
Jan Brewer
Ineligible
| Blurb | Reason |
|---|---|
| 1014 – Irish forces led by Brian Boru clashed with the Vikings in the Battle of Clontarf. | refimprove |
| 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. | empty sections, needs expansion |
| 1923 – Gdynia was inaugurated as a Polish seaport on the coast of Gdańsk Bay, a southwestern bay of the Baltic Sea. | refimprove |
| 1935 – Poland adopted a new constitution, introducing a presidential system with certain elements of authoritarianism. | Stubby |
| 1968 – Students protesting the Vietnam War at Columbia University in New York City took over administration buildings and shut down the university. | original research |
| 1982 – The City of Key West in 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, improper tone |
Eligible
- 1348 – The first-ever appointments to the Order of the Garter, an order of chivalry founded by King Edward III of England and still bestowed on recipients in the Commonwealth realms, were announced.
- 1951 – American journalist William N. Oatis was arrested for espionage by the Communist government of Czechoslovakia.
- 1979 – Activist Blair Peach suffered fatal head injuries after being knocked unconscious during an Anti-Nazi League demonstration in Southall, London, against a British 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.
April 23: World Book Day; Saint George's Day in various countries; Children's Day in Turkey
- 1661 – Charles II, King of England, Ireland, and Scotland was crowned at Westminster Abbey.
- 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 of the Milwaukee Braves hit the first of his record-setting 755 home runs in Major League Baseball.
- 1961 – In the midst of the Algerian War, French President Charles de Gaulle (pictured) delivered a televised speech calling on military personnel and civilians to oppose a coup d'état attempt against him.
- 1985 – The Coca-Cola Company introduced "New Coke" to replace its flagship soft drink Coca-Cola, which generated so much negative response that the company put the previous formula back on the market less than three months later.
- 2009 – Gamma ray burst GRB 090423 was detected, coming from the most distant known astronomical object of any kind at the time.