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

  • 1683
    Antonie van Leeuwenhoek writes a letter to the Royal Society describing “animalcules”: the first known description of protozoa.
  • 1775
    American Revolutionary War: The Invasion of Canada begins with the Siege of Fort St. Jean.
  • 1776
    The Presidio of San Francisco is founded in New Spain.
  • 1809
    Peace between Sweden and Russia in the Finnish War. The territory to become Finland is ceded to Russia by the Treaty of Fredrikshamn.
  • 1849
    American abolitionist Harriet Tubman escapes from slavery.
  • 1859
    Joshua A. Norton declares himself “Emperor Norton I” of the United States.
  • 1894
    The Battle of Yalu River, the largest naval engagement of the First Sino-Japanese War.
  • 1914
    Andrew Fisher becomes Prime Minister of Australia for the third time.
  • 1920
    The American Professional Football Association (later renamed National Football League) is organized in Canton, Ohio, United States.
  • 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.
  • 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.
  • 1948
    The Lehi (also known as the Stern gang) assassinates Count Folke Bernadotte, who was appointed by the UN to mediate between the Arab nations and Israel.
  • 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.
  • 1992
    An Iranian Kurdish leader and his two joiners are assassinated by political militants in Berlin, Germany.
  • 1993
    Last Russian troops leave Poland.
  • 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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