About September 23
September 23, 2025 is the 266th day of the year 2025 in the Gregorian calendar. There are 99 days remaining until the end of this year. The day of the week is Tuesday.
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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 147 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
- 1409 –Battle of Kherlen, the second significant victory over Ming China by the Mongols since 1368.
- 1779 –American Revolution: a squadron commanded by John Paul Jones on board the USS Bonhomme Richard wins the Battle of Flamborough Head, off the coast of England, against two British warships.
- 1803 –Second Anglo-Maratha War: Battle of Assaye between the British East India Company and the Maratha Empire in India.
- 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.
- 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.
- 1936 –First ascent of Siniolchu by a German team.
- 1941 –World War II: The first gas chamber experiments are conducted at Auschwitz.
- 1943 –World War II: The Nazi puppet state the Italian Social Republic is founded.
- 1959 –Iowa farmer and corn breeder Roswell Garst hosts Soviet premier Nikita Khrushchev.
- 1973 –Juan Perón returns to power in Argentina.
- 1983 –Gulf Air Flight 771 is bombed, killing all 117 people on board.
- 1983 –Saint Kitts and Nevis joins the United Nations.
- 1999 –Celebrate Bisexuality Day was first observed in the United States.
- 1999 –NASA announces that it has lost contact with the Mars Climate Orbiter.
- 1999 –Qantas Flight 1 overruns the runway in Bangkok during a storm. Although some passengers only receive minor injuries, it is still the worst crash in Qantas’s history since 1960.
- 2004 –Hurricane Jeanne: At least 1,070 in Haiti are reported to have been killed by floods.
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