About September 23
September 23, 2023 is the 266th day of the year 2023 in the Gregorian calendar. There are 99 days remaining until the end of this year. The day of the week is Saturday.
You can browse the full year calendar in case you need it.
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Virgo is the sun sign of a person born on this day. Sapphire is the modern birthstone for this month. Agate is the mystical birthstone from Tibetan origin that dates back over a thousand years.
According to the lunisolar Chinese calendar, there are 140 days remaining before the start of the next Chinese New Year.
September 23: More About This Day
It is frequently the day of the Autumnal Equinox in the Northern Hemisphere and the day of the Vernal Equinox in the Southern Hemisphere.
What Happened On September 23
- 1122 –Pope Calixtus II and Holy Roman Emperor Henry V agree to the Concordat of Worms to put an end to the Investiture Controversy.
- 1459 –Battle of Blore Heath, the first major battle of the English Wars of the Roses, is fought at Blore Heath in Staffordshire.
- 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, falls and 30,000 Turks are massacred 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 –Neptune is discovered by French astronomer Urbain Jean Joseph Le Verrier and British astronomer John Couch Adams; the discovery is verified by German astronomer Johann Gottfried Galle.
- 1857 –The Russian warship Lefort capsizes and sinks during a storm in the Gulf of Finland, killing all 826 aboard.
- 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.
- 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.
- 1952 –Richard Nixon makes his “Checkers speech”.
- 1959 –Iowa farmer and corn breeder Roswell Garst hosts Soviet premier Nikita Khrushchev.
- 1969 –The Chicago Eight trial opens in Chicago.
- 1983 –Saint Kitts and Nevis joins the United Nations.
- 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.
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