About September 20
September 20, 2025 is the 263rd day of the year 2025 in the Gregorian calendar. There are 102 days remaining until the end of this year. The day of the week is Saturday.
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 150 days remaining before the start of the next Chinese New Year.
What Happened On September 20
- 1260 –the Great Prussian Uprising among the old Prussians begins against the Teutonic Knights.
- 1378 –Cardinal Robert of Geneva, called by some the Butcher of Cesena, is elected as Avignon Pope Clement VII, beginning the Papal schism.
- 1519 –Ferdinand Magellan sets sail from Sanlúcar de Barrameda with about 270 men on his expedition to circumnavigate the globe.
- 1596 –Diego de Montemayor founds the city of Monterrey in New Spain.
- 1697 –The Treaty of Rijswijk is signed by France, England, Spain, the Holy Roman Empire and the Dutch Republic ending the Nine Years’ War (1688–97).
- 1737 –The finish of the Walking Purchase which forces the cession of 1.2 million acres (4,860 km²) of Lenape-Delaware tribal land to the Pennsylvania Colony.
- 1792 –French troops stop allied invasion of France, during the War of the First Coalition at Valmy.
- 1835 –Ragamuffin rebels capture Porto Alegre, then capital of the Brazilian imperial province of Rio Grande do Sul, triggering the start of ten-year-long Farroupilha Revolution.
- 1848 –The American Association for the Advancement of Science is created.
- 1854 –Battle of Alma: British and French troops defeat Russians in the Crimea.
- 1871 –Bishop John Coleridge Patteson is martyred on the island of Nukapu, a Polynesian outlier island now in the Temotu Province of the Solomon Islands. He is the first bishop of Melanesia.
- 1920 –Foundation of the Spanish Legion.
- 1942 –Holocaust in Letychiv, Ukraine. In the course of two days the German SS murders at least 3,000 Jews.
- 1961 –Greek general Konstantinos Dovas becomes Prime Minister of Greece.
- 1962 –James Meredith, an African-American, is temporarily barred from entering the University of Mississippi.
- 1971 –Having weakened after making landfall in Nicaragua the previous day, Hurricane Irene regains enough strength to be renamed Hurricane Olivia, making it the first known hurricane to cross from the Atlantic Ocean into the Pacific.
- 1973 –Billie Jean King beats Bobby Riggs in The Battle of the Sexes tennis match at the Houston Astrodome in Houston, Texas.
- 1979 –A coup d'état in the Central African Empire overthrows Emperor Bokasa I.
- 1984 –A suicide bomber in a car attacks the U.S. embassy in Beirut, Lebanon, killing twenty-two people.
- 2000 –The British MI6 Secret Intelligence Service building is attacked by unapprehended forces using a Russian-built RPG-22 anti-tank missile.
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