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It is frequently the day of the autumnal equinox in the Northern Hemisphere and the day of the vernal equinox in the Southern Hemisphere. ==Events== *1122 – Pope Callixtus II and Holy Roman Emperor Henry V agree to the Concordat of Worms to put an end to the Investiture Controversy. *1338 – The Battle of Arnemuiden was the first naval battle of the Hundred Years' War and the first naval battle using artillery, as the English ship Christofer had three cannon and one hand gun. *1409 – Battle of Kherlen, the second significant victory over Ming dynasty China by the Mongols since 1368. *1459 – Battle of Blore Heath, the first major battle of the English Wars of the Roses, is fought at Blore Heath in Staffordshire. *1568 – Spanish naval forces rout an English fleet, under the command of John Hawkins, at the Battle of San Juan de Ulúa near Veracruz. *1641 – The ''Merchant Royal'', carrying a treasure worth over a billion US dollars, is lost at sea off Land's End. *1642 – First commencement exercises occur at Harvard College. *1779 – American Revolution: John Paul Jones on board the wins the Battle of Flamborough Head. *1780 – American Revolution: British Major John André is arrested as a spy by American soldiers exposing Benedict Arnold's change of sides. *1803 – Second Anglo-Maratha War: Battle of Assaye between the British East India Company and the Maratha Empire in India. *1806 – Lewis and Clark return to St. Louis after exploring the Pacific Northwest of the United States. *1821 – Tripolitsa, Greece, is captured by Greek rebels during the Greek War of Independence. *1845 – The Knickerbockers Baseball Club, the first baseball team to play under the modern rules, is founded in New York. *1846 – Astronomers Urbain Jean Joseph Le Verrier, John Couch Adams and Johann Gottfried Galle collaborate on the discovery of Neptune. *1868 – Grito de Lares ("Lares Revolt") occurs in Puerto Rico against Spanish rule. *1889 – ''Nintendo'' Koppai (Later ''Nintendo'' Company, Limited) is founded by Fusajiro Yamauchi to produce and market the playing card game Hanafuda. *1899 – American Asiatic Squadron destroys a Filipino battery at the ''Battle of Olongapo''. *1905 – Norway and Sweden sign the "Karlstad treaty", peacefully dissolving the Union between the two countries. *1908 – University of Alberta in Alberta, Canada, is founded. *1909 – ''The Phantom of the Opera'' (original title: ''Le Fantôme de l'Opéra''), a novel by French writer Gaston Leroux, is first published as a serialization in ''Le Gaulois''. *1911 – Pilot Earle Ovington makes the first official airmail delivery in America under the authority of the United States Post Office Department *1913 – Roland Garros of France becomes the first to fly in an airplane across the Mediterranean (from St. Raphael France to Bizerte, Tunisia). *1932 – The Kingdom of Hejaz and Nejd is renamed the Kingdom of Saudi Arabia. *1936 – First ascent of Siniolchu by a German team. *1938 – Mobilization of the Czechoslovak army in response to the Munich Crisis. *1942 – World War II: The Matanikau action on Guadalcanal begins: U.S. Marines attack Japanese units along the Matanikau River. *1943 – World War II: The Nazi puppet state the Italian Social Republic is founded. *1950 – Korean War: The Battle of Hill 282: The first US friendly-fire incident on British military personnel since World War II occurs. *1952 – Richard Nixon makes his "Checkers speech". *1959 – Iowa farmer and corn breeder Roswell Garst hosts Soviet premier Nikita Khrushchev. * 1959 – The , Australia's first passenger roll-on/roll-off diesel ferry, makes her maiden voyage across Bass Strait. *1962 – The Lincoln Center for the Performing Arts opens in New York City. *1969 – The Chicago Eight trial opens in Chicago. *1973 – Juan Perón returns to power in Argentina. *1980 – Bob Marley plays what would be his last concert in Pittsburgh. *1983 – Saint Kitts and Nevis joins the United Nations. * 1983 – Gerrie Coetzee of South Africa becomes the first African boxing world heavyweight champion. * 1983 – Gulf Air Flight 771 is destroyed by a bomb, killing all 117 people on board. *1986 – Jim Deshaies of the Houston Astros sets a major league record by striking out the first eight batters he faces in a game against the Los Angeles Dodgers. *1988 – José Canseco of the Oakland Athletics becomes the first member of the 40–40 club. *1992 – A large Provisional Irish Republican Army bomb destroys forensic laboratories in Belfast. *1999 – Celebrate Bisexuality Day was first observed in the United States. * 1999 – NASA announces that it has lost contact with the Mars Climate Orbiter. *2002 – The first public version of the web browser Mozilla Firefox ("Phoenix 0.1") is released. *2004 – Over 3,000 people die in Haiti after Hurricane Jeanne produces massive flooding and mudslides. *2008 – Kauhajoki school shooting: Matti Saari kills ten people before committing suicide. *2010 – Convict Teresa Lewis became the first female inmate to die by lethal injection in the state of Virginia. *2015 – On Washington, D.C., Pope Francis canonized Father Junipero Serra as a saint. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「September 23」の詳細全文を読む スポンサード リンク
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