Wikipedia:Selected anniversaries/September 23

This is a list of selected September 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.

← September 22	September 24 →

Staging area

Images

Use only ONE image at a time

• 
  Richard Nixon delivering the Checkers speech
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  Benedict Arnold
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  Ramon Betances
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  Ramón Emeterio Betances
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  Neptune
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  Nintendo headquarters, 1889

Ineligible

Blurb	Reason
National Day in Saudi Arabia (1932)	both "National Day" article and the country itself are orange tagged
1459 – Yorkist forces led by Richard Neville defeated Lancastrian troops at the Battle of Blore Heath in Staffordshire, England, a major battle of the Wars of the Roses.	refimprove section
1779 – American Revolutionary War: John Paul Jones led a Franco-American squadron to victory in the Battle of Flamborough Head, one of the most celebrated naval actions of the war.	rewrite, primary
1821 – Greek War of Independence: Greek rebels captured Tripolitsa after a five-month siege and began a massacre of Muslim and Jewish residents.	needs more footnotes (9 {cn} tags)
Vincenzo Bellini |d|1835|	Heaps of unsourced paras
1845 – American bookseller Alexander Cartwright founded the New York Knickerbockers, one of the first organized baseball teams.	refimprove
1846 – Using mathematical predictions by French mathematician Urbain Le Verrier, German astronomer Johann Gottfried Galle became the first person to observe Neptune and recognise it as a hitherto unknown planet.	lots of CN tags (7)
1868 – Ramón Emeterio Betances led the Grito de Lares, a revolt against Spanish rule in Puerto Rico.	needs more footnotes
1889 – Fusajiro Yamauchi founded Nintendo in Kyoto, Japan (original headquarters pictured), to produce handmade hanafuda playing cards.	Citation problems
1899 – Philippine–American War: The American Asiatic Squadron destroyed a Filipino artillery battery in Olongapo.	one source
1932 – The Kingdom of Hejaz and Nejd merged with Al-Hasa and Qatif to form the Kingdom of Saudi Arabia, with Ibn Saud as the first monarch and Riyadh as the capital city.	refimprove
1983 – A bomb placed by the Abu Nidal organisation destroyed Gulf Air Flight 771, flying from Karachi, Pakistan, to Abu Dhabi, UAE, killing all 112 people aboard.	expansion
2002 – The first version of the web browser Firefox was released by the Mozilla Organization.	lots of citations needed (16)
Francesco Barberini |b|1597|	lots of citations needed (7)
El Santo |b|1917	refimprove section
Bruce Springsteen |b|1949	refimprove

Eligible

• 1780 – American Revolutionary War: British officer John André was captured by Patriot forces, thereby revealing a plot by Continental Army general Benedict Arnold to hand over West Point, New York.
• 1803 – Maratha troops were defeated by forces of the British East India Company at the Battle of Assaye, one of the decisive battles of the Second Anglo-Maratha War.
• 1913 – The United Mine Workers of America begin a strike against the Rockefeller-owned Colorado Fuel & Iron Company, sparking the Colorado Coalfield War.
• 1952 – U.S. vice-presidential candidate Richard Nixon delivered the Checkers speech (pictured), one of the first political uses of television to appeal directly to the populace.
• 2008 – A gunman shot and killed ten students at the Seinäjoki University of Applied Sciences in Kauhajoki, Finland, before committing suicide.
• 2010 – Teresa Lewis became the first woman to be executed by the U.S. state of Virginia since 1912, and the first woman in the state to be executed via lethal injection.
• 2016 – Following a number of high-profile sexual assaults, major reforms were enacted to strengthen laws related to rape in Germany.
• 2019 – The British travel company Thomas Cook Group ceased operations with immediate effect, leaving around 600,000 tourists stranded around the world.
• Born this day: Eleonora Gonzaga |b|1598| Joseph Dudley |b|1647| John Ainsworth Horrocks |d|1846| Émilie Gamelin |d|1851| Ellen Hayes |b|1851| Paul Delvaux |b|1897| Louise Nevelson |b|1899| Werner Voss |d|1917| Ambroise Noumazalaye |b|1933| Sigmund Freud |d|1939| Kostas Tournas |b|1949| Cherie Blair |b|1954| Michiru Yamane |b|1963| Sean Spicer |b|1971 }}

September 23: Celebrate Bisexuality Day

Concordat of Worms

• 1122 – Pope Callixtus II and Holy Roman emperor Henry V agreed the Concordat of Worms (pictured), ending the Investiture Controversy.
• 1642 – First English Civil War: The Battle of Powick Bridge, the first engagement between the primary field armies of the Royalists and the Parliamentarians, ended in a Royalist victory.
• 1884 – The French steamship Arctique ran aground on the northern coast of Cape Virgenes in Argentina; gold was discovered during the rescue effort, triggering the Tierra del Fuego gold rush.
• 1920 – The Louisiana hurricane dissipated over Kansas after forcing around 4,500 people to evacuate and causing $1.45 million in damages.
• 2010 – Teresa Lewis became the first woman to be executed by the U.S. state of Virginia since 1912, and the first woman in the state to be executed by lethal injection.

• Augustus (b. 63 BC)
• Sir Richard Hughes, 1st Baronet (d. 1779)
• Émilie Gamelin (d. 1851)
• Zdenko Blažeković (b. 1915)

More anniversaries:

• September 22
• September 23
• September 24