About September 17

September 17, 2021 is the 260th day of the year 2021 in the Gregorian calendar. There are 105 days remaining until the end of this year. The day of the week is Friday.

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 137 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.
  • 1462
    The Battle of Świecino (also known as the Battle of Żarnowiec) is fought during Thirteen Years’ War.
  • 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).
  • 1787
    The United States Constitution is signed in Philadelphia, Pennsylvania.
  • 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.
  • 1859
    Joshua A. Norton declares himself “Emperor Norton I” of the United States.
  • 1862
    American Civil War: George B. McClellan halts the northward drive of Robert E. Lee’s Confederate army in the single-day Battle of Antietam, the bloodiest day in American history.
  • 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.
  • 1941
    World War II: A decree of the Soviet State Committee of Defense, restoring Vsevobuch in the face of the Great Patriotic War, is issued
  • 1943
    World War II: The Russian city of Bryansk is liberated from Nazis.
  • 1978
    The Camp David Accords are signed by Israel and Egypt.
  • 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.
  • 2011
    Occupy Wall Street movement began in Zucotti Park, New York City.

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