About September 17

September 17, 2025 is the 260th day of the year 2025 in the Gregorian calendar. There are 105 days remaining until the end of this year. The day of the week is Wednesday.

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 153 days remaining before the start of the next Chinese New Year.

What Happened On September 17

  • 1176
    The Battle of Myriokephalon is fought.
  • 1577
    The Peace of Bergerac is signed between Henry III of France and the Huguenots.
  • 1631
    Sweden wins a major victory at the Battle of Breitenfeld against the Holy Roman Empire during the Thirty Years War.
  • 1775
    American Revolutionary War: The Invasion of Canada begins with the Siege of Fort St. Jean.
  • 1787
    The United States Constitution is signed in Philadelphia, Pennsylvania.
  • 1894
    The Battle of Yalu River, the largest naval engagement of the First Sino-Japanese War.
  • 1908
    The Wright Flyer flown by Orville Wright, with Lieutenant Thomas Selfridge as passenger, crashes killing Selfridge. He becomes the first airplane fatality.
  • 1920
    The American Professional Football Association (later renamed National Football League) is organized in Canton, Ohio, United States.
  • 1924
    The Border Defence Corps is established in the Second Polish Republic for the defence of the eastern border against armed Soviet raids and local bandits.
  • 1928
    The Okeechobee Hurricane strikes southeastern Florida, killing upwards of 2,500 people. It is the third deadliest natural disaster in United States history, behind the Galveston Hurricane of 1900 and the 1906 San Francisco earthquake.
  • 1940
    World War II: Following the German defeat in the Battle of Britain, Hitler postpones Operation Sea Lion indefinitely.
  • 1943
    World War II: The Russian city of Bryansk is liberated from Nazis.
  • 1944
    World War II: Allied Airborne troops parachute into the Netherlands as the “Market” half of Operation Market Garden.
  • 1974
    Bangladesh, Grenada and Guinea-Bissau join the United Nations.
  • 1980
    Former Nicaraguan President Anastasio Somoza Debayle is killed in Asunción, Paraguay.
  • 1983
    Vanessa Williams becomes the first black Miss America.
  • 1991
    The first version of the Linux kernel (0.01) is released to the Internet.
  • 1993
    Last Russian troops leave Poland.
  • 2001
    The New York Stock Exchange reopens for trading after the September 11 Attacks, the longest closure since the Great Depression.
  • 2006
    Fourpeaked Mountain in Alaska erupts, marking the first eruption for the long-dormant volcano in at least 10,000 years.

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