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”.
- 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.
- 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.
- 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).
- 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.
- 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.
- 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.
- 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 –Taisto Mäki becomes the first man to run the 10,000 metres in under 30 minutes, in a time of 29:52.6
- 1939 –World War II: The Soviet Union joins Nazi Germany’s invasion of Poland during the Polish Defensive War of 1939.
- 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.
- 1961 –The world’s first retractable-dome stadium, the Civic Arena, opens in Pittsburgh.
- 1980 –After weeks of strikes at the Lenin Shipyard in Gdańsk, Poland, the nationwide independent trade union Solidarity is established.
- 1992 –An Iranian Kurdish leader and his two joiners are assassinated by political militants in Berlin, Germany.
- 2001 –The New York Stock Exchange reopens for trading after the September 11 Attacks, the longest closure since the Great Depression.
- 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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