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

  • 1642
    First commencement exercises occur at Harvard College.
  • 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.
  • 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.
  • 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.
  • 1932
    The Kingdom of Hejaz and Nejd is renamed the Kingdom of Saudi Arabia.
  • 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.
  • 1952
    Richard Nixon makes his “Checkers speech”.
  • 1962
    The Lincoln Center for the Performing Arts in New York City opens with the completion of the first building, the Philharmonic Hall (now Avery Fisher Hall) home of the New York Philharmonic.
  • 1969
    The Chicago Eight trial opens in Chicago.
  • 1973
    Juan Perón returns to power in Argentina.
  • 1983
    Gerrie Coetzee of South Africa becomes the first African boxing world heavyweight champion.
  • 1983
    Saint Kitts and Nevis joins the United Nations.
  • 1992
    A large Provisional Irish Republican Army bomb destroys forensic laboratories in Belfast.
  • 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.
  • 2002
    The first public version of the web browser Mozilla Firefox (“Phoenix 0.1”) is released.

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