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Wikipedia:Selected anniversaries/April 22

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This is an old revision of this page, as edited by Jayron32 (talk | contribs) at 13:36, 22 April 2013 (per T:MP). The present address (URL) is a permanent link to this revision, which may differ significantly from the current revision.

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This is a list of selected April 22 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 21 April 23
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Ineligible

Blurb Reason
1529 – Spain and Portugal signed the Treaty of Zaragoza, defining the areas of their respective influence in Asia. unreferenced section
1912 – The Bolshevik newspaper Pravda was first published in Saint Petersburg, Russia. refimprove
1915 – The Germans released chlorine gas as a chemical weapon in the Second Battle of Ypres, killing over 5,000 soldiers within ten minutes by asphyxiation in the first large-scale successful use of poison gas in World War I. Ypres has unreferenced section; chemical weapons in WW1 also has unreferenced section
1945 – About 600 prisoners of the Jasenovac concentration camp in the Independent State of Croatia revolted, but only 80 managed to escape while the other 520 were killed by the Croatian Ustaše regime. sources not reliable
1993 – The first version of Mosaic, created by computer programmers Marc Andreessen and Eric Bina at the National Center for Supercomputing Applications of the University of Illinois at Urbana-Champaign, was released, becoming the first popular web browser and Gopher client. tagged for expansion
2000 – In response to the rapid late 1990s growth of telecommunications, the United Kingdom enacted the Big Number Change, modifying the telephone numbering plans in various areas across the country. refimprove

Eligible

Notes

April 22: Earth Day

Pedro Álvares Cabral

  • 1500 – Portuguese explorer Pedro Álvares Cabral (pictured) and his crew landed in present day Brazil and claimed the land for Portugal.
  • 1930 – France, Italy, Japan, the United Kingdom, and the United States signed the London Naval Treaty, regulating submarine warfare and limiting military ship building.
More anniversaries: