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Wikipedia:Selected anniversaries/April 23

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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. 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.

April 22 April 24
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Images

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Ineligible

Blurb Reason
World Book Day; refimprove
Saint George's Day in various countries; refimprove section
1827 – Irish mathematician and physicist William Rowan Hamilton presented his Theory of Systems of Rays. refimprove section
1879 – A fire destroyed the second version of the Main Building of the University of Notre Dame, one of the oldest Catholic universities in the United States. incomplete citations/page numbers missing
1923Gdynia was inaugurated as a Polish seaport on the coast of Gdańsk Bay, a southwestern bay of the Baltic Sea. 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 ZX Spectrum (pictured), Britain's best-selling microcomputer, was released. Lots of uncited material
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 section
* 1516 – The best-known version of the Reinheitsgebot, a German law on the purity of beer, was adopted in Bavaria. Number of uncited parts
* 1016Edmund Ironside became King of England, reigning for only seven months before the country was conquered by Cnut the Great. Section tagged for referencing
* 1985The 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. Citations needed
Shirley Temple |b|1928 tag

Eligible

Notes

  • ZX81 appears on March 5, so ZX Spectrum should not appear in the same year.

April 23: National Sovereignty and Children's Day in Turkey (1920)

Liberation of Flossenbürg
Liberation of Flossenbürg
More anniversaries: