What are the important events that happened on September 23? Here are historical events, facts, and some myths about this day.

September 23: Facts & Myths About This Day

September 23 is the 266^th 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.

Under the Julian calendar, this day is September 10, 2025 – a Tuesday. Both day of the week are the same but did you notice the difference with the Gregorian calendar?

When this day started, 29,309,760 minutes has elapsed since midnight of January 1, 1970 – the Unix epoch.

Strange as it may, if we name this day after a polygon then it will be called ‘dihectahexacontahexagon’ day.

Virgo is the zodiac 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.

The ancient Maya civilization believes that the end of the world will happen on December 21, 2012. There are now 4,659 days since this fabled cataclysmic event.

September 23: This Day In History

It is frequently the day of the Autumnal Equinox in the Northern Hemisphere and the day of the Vernal Equinox in the Southern Hemisphere.

September 23 Historical Events

• 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.
• 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.
• 1959 –
  Iowa farmer and corn breeder Roswell Garst hosts Soviet premier Nikita Khrushchev.
• 1969 –
  The Chicago Eight trial opens in Chicago.
• 1983 –
  Gerrie Coetzee of South Africa becomes the first African boxing world heavyweight champion.
• 1999 –
  Celebrate Bisexuality Day was first observed in the United States.
• 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.

Who were born on September 23?

• 1861 –
  Robert Bosch, German inventor and industrialist (d. 1942)
• 1907 –
  Albert Ammons, American boogie-woogie pianist (d. 1949)
• 1915 –
  Clifford Shull, American physicist, Nobel Laureate (d. 2001)
• 1925 –
  Denis Twitchett, Cambridge scholar, and Chinese historian (d. 2006)
• 1958 –
  Marvin Lewis, American football coach
• 1969 –
  Donald Audette, Canadian ice hockey player
• 1971 –
  Lee Mi-yeon, South Korean actress
• 1972 –
  Ana Marie Cox, American blogger and author
• 1974 –
  Matt Hardy, American professional wrestler
• 1976 –
  Kip Pardue, American actor and model

Who died on September 23?

• 1535 –
  Catherine of Saxe-Lauenburg, queen of Gustav I of Sweden (b. 1513)
• 1873 –
  Jean Chacornac, French astronomer (b. 1823)
• 1917 –
  Werner Voss, German World War I pilot (b. 1897)
• 1943 –
  Elinor Glyn, English author (b. 1864)
• 1958 –
  Jacob Nicol, Canadian newspaper publisher and politician (b. 1876)
• 1974 –
  Cliff Arquette, American comedian and actor (b. 1905)
• 1988 –
  Tibor Sekelj, Jewish-Yugoslavian explorer (b. 1912)
• 2004 –
  André Hazes, Dutch singer (b. 1951)
• 2005 –
  Filiberto Ojeda Ríos, Puerto Rican revolutionary (b. 1933)
• 2009 –
  Paul B. Fay, American businessman and cabinet member in the Kennedy administration (b. 1918