About September 17

September 17, 2020 is the 261st day of the year 2020 in the Gregorian calendar. There are 105 days remaining until the end of this year. The day of the week is Thursday.

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 148 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.
  • 1577
    The Peace of Bergerac is signed between Henry III of France and the Huguenots.
  • 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).
  • 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”.
  • 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.
  • 1900
    Philippine-American War: Filipinos under Juan Cailles defeat Americans under Colonel Benjamin F. Cheatham at Mabitac.
  • 1920
    The American Professional Football Association (later renamed National Football League) is organized in Canton, Ohio, United States.
  • 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
  • 1948
    The Nizam of Hyderabad surrenders his sovereignty over the Hyderabad State and joins the Indian Union.
  • 1980
    Former Nicaraguan President Anastasio Somoza Debayle is killed in Asunción, Paraguay.
  • 2001
    The New York Stock Exchange reopens for trading after the September 11 Attacks, the longest closure since the Great Depression.
  • 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.
  • 2006
    Fourpeaked Mountain in Alaska erupts, marking the first eruption for the long-dormant volcano in at least 10,000 years.

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