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

  • 1111
    Highest Galician nobility led by Pedro Fróilaz de Traba and the bishop Diego Gelmírez crown Alfonso VII as “King of Galicia”.
  • 1462
    The Battle of Świecino (also known as the Battle of Żarnowiec) is fought during Thirteen Years’ War.
  • 1630
    The city of Boston, Massachusetts is founded.
  • 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.
  • 1814
    Francis Scott Key finishes his poem “Defence of Fort McHenry”, later to be the lyrics of “The Star-Spangled Banner”.
  • 1859
    Joshua A. Norton declares himself “Emperor Norton I” of the United States.
  • 1908
    The Wright Flyer flown by Orville Wright, with Lieutenant Thomas Selfridge as passenger, crashes killing Selfridge. He becomes the first airplane fatality.
  • 1914
    Andrew Fisher becomes Prime Minister of Australia for the third time.
  • 1916
    World War I: Manfred von Richthofen (“The Red Baron”), a flying ace of the German Luftstreitkräfte, wins his first aerial combat near Cambrai, France.
  • 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.
  • 1939
    World War II: A German U-boat U 29 sinks the British aircraft carrier HMS Courageous.
  • 1939
    World War II: The Soviet Union joins Nazi Germany’s invasion of Poland during the Polish Defensive War of 1939.
  • 1940
    World War II: Following the German defeat in the Battle of Britain, Hitler postpones Operation Sea Lion indefinitely.
  • 1944
    World War II: Allied Airborne troops parachute into the Netherlands as the “Market” half of Operation Market Garden.
  • 1980
    Former Nicaraguan President Anastasio Somoza Debayle is killed in Asunción, Paraguay.
  • 1992
    An Iranian Kurdish leader and his two joiners are assassinated by political militants in Berlin, Germany.
  • 2006
    Fourpeaked Mountain in Alaska erupts, marking the first eruption for the long-dormant volcano in at least 10,000 years.
  • 2007
    AOL, once the largest ISP in the U.S., officially announces plans to refocus the company as an advertising business and to relocate its corporate headquarters from Dulles, Virginia to New York, New York.

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