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.
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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
- 1111 –Highest Galician nobility led by Pedro Fróilaz de Traba and the bishop Diego Gelmírez crown Alfonso VII as “King of Galicia”.
- 1462 –The Battle of Świecino (also known as the Battle of Żarnowiec) is fought during Thirteen Years’ War.
- 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.
- 1775 –American Revolutionary War: The Invasion of Canada begins with the Siege of Fort St. Jean.
- 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.
- 1908 –The Wright Flyer flown by Orville Wright, with Lieutenant Thomas Selfridge as passenger, crashes killing Selfridge. He becomes the first airplane fatality.
- 1914 –Andrew Fisher becomes Prime Minister of Australia for the third time.
- 1916 –World War I: Manfred von Richthofen (“The Red Baron”), a flying ace of the German Luftstreitkräfte, wins his first aerial combat near Cambrai, France.
- 1920 –The American Professional Football Association (later renamed National Football League) is organized in Canton, Ohio, United States.
- 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.
- 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.
- 1944 –World War II: Allied Airborne troops parachute into the Netherlands as the “Market” half of Operation Market Garden.
- 1980 –Former Nicaraguan President Anastasio Somoza Debayle is killed in Asunción, Paraguay.
- 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.
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