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”.
  • 1176 –
    The Battle of Myriokephalon is fought.
  • 1814 –
    Francis Scott Key finishes his poem “Defence of Fort McHenry”, later to be the lyrics of “The Star-Spangled Banner”.
  • 1849 –
    American abolitionist Harriet Tubman escapes from slavery.
  • 1862 –
    American Civil War: The Allegheny Arsenal explosion results in the single largest civilian disaster during the war.
  • 1908 –
    The Wright Flyer flown by Orville Wright, with Lieutenant Thomas Selfridge as passenger, crashes killing Selfridge. He becomes the first airplane fatality.
  • 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.
  • 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.
  • 1948 –
    The Nizam of Hyderabad surrenders his sovereignty over the Hyderabad State and joins the Indian Union.
  • 1949 –
    The Canadian steamship SS Noronic burns in Toronto Harbour with the loss of over 118 lives.
  • 1957 –
    Malaysia joins the United Nations.
  • 1978 –
    The Camp David Accords are signed by Israel and Egypt.
  • 1980 –
    Former Nicaraguan President Anastasio Somoza Debayle is killed in Asunción, Paraguay.
  • 1991 –
    Estonia, North Korea, South Korea, Latvia, Lithuania, the Marshall Islands and Micronesia join the United Nations.
  • 2001 –
    The New York Stock Exchange reopens for trading after the September 11 Attacks, the longest closure since the Great Depression.
  • 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.
  • 2011 –
    Occupy Wall Street movement began in Zucotti Park, New York City.

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