About September 23

September 23, 2021 is the 266th day of the year 2021 in the Gregorian calendar. There are 99 days remaining until the end of this year. The day of the week is Thursday.

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 131 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.
  • 1409
    Battle of Kherlen, the second significant victory over Ming China by the Mongols since 1368.
  • 1641
    The Merchant Royal, carrying a treasure worth over a billion US dollars, is lost at sea off Land’s End.
  • 1780
    American Revolution: British Major John André is arrested as a spy by American soldiers exposing Benedict Arnold’s change of sides.
  • 1821
    Tripolitsa, Greece, falls and 30,000 Turks are massacred during the Greek War of Independence.
  • 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.
  • 1868
    Grito de Lares (“Lares Revolt”) occurs in Puerto Rico against Spanish rule.
  • 1905
    Norway and Sweden sign the “Karlstad treaty”, peacefully dissolving the Union between the two countries.
  • 1932
    The Kingdom of Hejaz and Nejd is renamed the Kingdom of Saudi Arabia.
  • 1936
    First ascent of Siniolchu by a German team.
  • 1943
    World War II: The Nazi puppet state the Italian Social Republic is founded.
  • 1969
    The Chicago Eight trial opens in Chicago.
  • 1972
    Philippine President Ferdinand Marcos announces over television and radio the implementation of martial law.
  • 1973
    Juan Perón returns to power in Argentina.
  • 1983
    Gerrie Coetzee of South Africa becomes the first African boxing world heavyweight champion.
  • 1986
    Jim Deshaies of the Houston Astros sets the major-league record by striking out the first eight batters of the game against the Los Angeles Dodgers.
  • 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.
  • 2008
    Kauhajoki school shooting: Matti Saari kills 10 people before committing suicide.

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