About September 23

September 23, 2024 is the 267th day of the year 2024 in the Gregorian calendar. There are 99 days remaining until the end of this year. The day of the week is Monday.

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 128 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.
  • 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.
  • 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.
  • 1889
    Nintendo Koppai (Later Nintendo Company, Limited) is founded by Fusajiro Yamauchi to produce and market the playing card game Hanafuda.
  • 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.
  • 1938
    Mobilization of the Czechoslovak army in response to the Munich Crisis.
  • 1941
    World War II: The first gas chamber experiments are conducted at Auschwitz.
  • 1942
    World War II: First day of the September Matanikau action on Guadalcanal as United States Marine Corps forces attack Imperial Japanese Army units along the Matanikau River.
  • 1952
    Richard Nixon makes his “Checkers speech”.
  • 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.
  • 2002
    The first public version of the web browser Mozilla Firefox (“Phoenix 0.1”) is released.
  • 2008
    Kauhajoki school shooting: Matti Saari kills 10 people before committing suicide.

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