About December 17

December 17, 2025 is the 351st day of the year 2025 in the Gregorian calendar. There are 14 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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Sagittarius is the sun sign of a person born on this day. Turquoise is the modern birthstone for this month. Onyx is the mystical birthstone from Tibetan origin that dates back over a thousand years.

According to the lunisolar Chinese calendar, there are 62 days remaining before the start of the next Chinese New Year.

What Happened On December 17

  • 920
    Romanos I is crowned co-emperor of the underage Emperor Constantine VII.
  • 1398
    Sultan Nasir-u Din Mehmud’s armies in Delhi are defeated by Timur.
  • 1583
    Cologne War: Forces under Ernest of Bavaria defeats the troops under Gebhard Truchsess von Waldburg at the Siege of Godesberg.
  • 1600
    Marriage of Henry IV of France and Marie de' Medici.
  • 1790
    Discovery of the Aztec calendar stone.
  • 1807
    France issues the Milan Decree, which confirms the Continental System.
  • 1812
    War of 1812: U.S. forces attack a friendly Lenape village in the Battle of the Mississinewa.
  • 1819
    Simón Bolívar declares the independence of the Republic of Gran Colombia in Angostura (now Ciudad Bolívar in Venezuela).
  • 1837
    Fire in the Winter Palace of Saint Petersburg occurred.
  • 1935
    First flight of the Douglas DC-3 airplane.
  • 1947
    First flight of the Boeing B-47 Stratojet strategic bomber.
  • 1950
    The F-86 Sabre’s first mission over Korea.
  • 1957
    The United States successfully launches the first Atlas intercontinental ballistic missile at Cape Canaveral, Florida.
  • 1960
    Troops loyal to Haile Selassie I in Ethiopia crush the coup that began December 13, returning power to their leader upon his return from Brazil. Haile Selassie absolves his son of any guilt.
  • 1961
    Fire in the Gran Circus American in the city of Niterói, Rio de Janeiro, Brazil, the biggest tragedy in circus history.
  • 1969
    Project Blue Book: The United States Air Force closes its study of UFOs, stating that sightings are generated as a result of “A mild form of mass hysteria, Individuals who fabricate such reports to perpetrate a hoax or seek publicity, psychopathological persons, and misidentification of various conventional objects.”
  • 1970
    Polish 1970 protests: In Gdynia soldiers fire at workers emerging from trains, killing dozens.
  • 1981
    Brigadier General James L. Dozier is abducted by the Red Brigade in Verona, Italy.
  • 2002
    Second Congo War: The Congolese parties of the Inter Congolese Dialogue sign a peace accord which makes provision for transitional governance and legislative and presidential elections within two years.
  • 2005
    Jigme Singye Wangchuck abdicate the throne as King of Bhutan.

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