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The 23rd o September is the 266t day o the year (267t in lowp years) in the Gregorian Calendar, wi 99 day left.
- 1806 - The Meriwether Lewis an William Clark expedeetion returns tae St. Louis, Missouri.
- 1846 - Offeecial Discovery o Neptune bi Johann Gottfried Galle.
- 1905 - Norawa an Swaden sign the Treaty o Karlstad, endin the union atween thair kintras.
- 1913 - Roland Garros flies across the Mediterranean Sea frae San Raphael, Fraunce tae Bizerte, Tunisie.
- 1932 - The Kinrick o Hejaz an Nejd is renamit Saudi Arabie.
- 1972 - In the Philippines, Preses Ferdinand Marcos propales the implementation o mairtial law.
- 1973 - Juan Peron returns tae pouer in Argentinae.
- 1983 - Saunt Kitts an Nevis jynes the Unitit Naitions.
- 1993 - Sydney, Australie is gien the richt tae host the 2000 Simmer Olympics.
- 1999 - Contact is lost wi the Mars Climate Orbiter.
- 2004 - Hurricane Jeanne kills 1,070 fowk in Haiti.
- 2008 - 10 fowk are kilt in the Kauhajoki Schuil shuitin in Finland; the gunman later turns the gun on hisself.
- 2009 - A major dust storm affects Eastren Australie, incluidin Sydney.
- 2017 - New Zealand general election: The centre-richt Naitional Pairty unner Prime meenister Bill English acomes the lairgest pairty for the 4t consecutive term; The Labour Pairty improves its share o the vote unner Jacinda Ardern.
- 2017 - Iran declares that it haes testit a medium-range missile in response tae a speech bi US Preses Donald Trump.
- 2019 - The traivel firm Thomas Cook collapses.
- 2019 - Roushie jyns the Paris Climate Agreement.
- 2019 - Climate chynge activist Greta Thunberg addresses a Unitit Naitions climate summit.
- 63 BC - Augustus, Roman Emperor (d. 14)
- 1215 - Kublai Khan, Mongol ruler (d. 1294)
- 1713 - Ferdinand VI o Spain (d. 1759)
- 1771 - Emperor Kokaku o Japan (d. 1840)
- 1852 - Robert Ramsay Wright, Scots zoologist (d. 1933)
- 1880 - John Boyd Orr, 1st Baron Boyd-Orr, Scots biologist, medicinar an politeecian (d. 1971)
- 1890 - Friedrich Paulus, German general (d. 1957)
- 1901 - Jaroslav Seifert, Czech writer (d. 1986)
- 1915 - Clifford Shull, American pheesicist (d. 2001)
- 1916 - Aldo Moro, Italian politeecian (d. 1978)
- 1917 - Andy Black, Scots fitbawer (d. 1989)
- 1917 - Asima Chatterjee, Indie organic chemist (d. 2006)
- 1920 - Mickey Rooney, American actor (d. 2014)
- 1926 - John Coltrane, American jazz saxophonist (d. 1967)
- 1930 - Ray Charles, American jazz pianist (d. 2004)
- 1938 - Romy Schneider, Austrick-born actress (d. 1982)
- 1940 - Michel Temer, umwhile Preses o Brazil
- 1943 - Julio Iglesias, Spaingie sangster
- 1946 - Bernard Maris, French economist, writer an jurnalist (d. 2015)
- 1946 - Jim McCalliog, Scots fitbawer
- 1949 - Bruce Springsteen, American sangster-sangwriter an muisicker
- 1953 - Kenny Burns, Scots fitbawer
- 1956 - Paolo Rossi, Italian fitbawer
- 1957 - Fergus Ewing, Scots politeecian
- 1959 - Jason Alexander, American comedian an actor
- 1968 - Adam Price, Welsh politeecian
- 1971 - Sean Spicer, umwhile White House Press Secretar
- 1988 - Juan Martin del Potro, Argentine tennis player
- 1992 - Finn Russell, Scots rugby union player
- 1993 - Jordon Forster, Scots fitbawer
- 76 - Pape Linus
- 1835 - Vincenzo Bellini, Italian componer (b. 1801)
- 1870 - Prosper Mérimée, French writer (b. 1803)
- 1877 - Urbain Le Verrier, French mathemateecian an astronomer (b. 1811)
- 1889 - Wilkie Collins, Inglis novelist, playwricht an short-story writer (b. 1824)
- 1929 - Richard Adolf Zsigmondy, Austrick-Hungarian chemist (b. 1865)
- 1939 - Sigmund Freud, Austrick psychoanalyst an psychologist (b. 1856)
- 1973 - Pablo Neruda, Chilean poet (b. 1904)
- 2006 - Malcolm Arnold, Inglis componer (b. 1921)
- 2014 - John Divers, Scots fitbawer (b. 1940)
- 2018 - Charles K. Kao, Cheenese-Hong Kong electrical ingineer an pheesicist (b. 1933)
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