About September 17

September 17, 2024 is the 261st day of the year 2024 in the Gregorian calendar. There are 105 days remaining until the end of this year. The day of the week is Tuesday.

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 134 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.
  • 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.
  • 1683
    Antonie van Leeuwenhoek writes a letter to the Royal Society describing “animalcules”: the first known description of protozoa.
  • 1776
    The Presidio of San Francisco is founded in New Spain.
  • 1778
    The Treaty of Fort Pitt is signed. It is the first formal treaty between the United States and a Native American tribe (the Lenape or Delaware Indians).
  • 1809
    Peace between Sweden and Russia in the Finnish War. The territory to become Finland is ceded to Russia by the Treaty of Fredrikshamn.
  • 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.
  • 1900
    Philippine-American War: Filipinos under Juan Cailles defeat Americans under Colonel Benjamin F. Cheatham at Mabitac.
  • 1914
    Andrew Fisher becomes Prime Minister of Australia for the third time.
  • 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.
  • 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.
  • 1957
    Malaysia joins the United Nations.
  • 2006
    An audio tape of a private speech by Hungarian Prime Minister Ferenc Gyurcsány is leaked to the public, in which he confessed that his Hungarian Socialist Party had lied to win the 2006 election, sparking widespread protests across the country.
  • 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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