About September 21
September 21, 2025 is the 264th day of the year 2025 in the Gregorian calendar. There are 101 days remaining until the end of this year. The day of the week is Sunday.
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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 149 days remaining before the start of the next Chinese New Year.
What Happened On September 21
- 1217 –Livonian Crusade: The Estonian tribal leader Lembitu and Livonian leader Kaupo are killed in Battle of St. Matthew’s Day.
- 1745 –Battle of Prestonpans: A Hanoverian army under the command of Sir John Cope is defeated, in ten minutes, by the Jacobite forces of Prince Charles Edward Stuart
- 1776 –Part of New York City is burned shortly after being occupied by British forces.
- 1792 –The National Convention declares France a republic and abolishes the monarchy.
- 1921 –A storage silo in Oppau, Germany, explodes, killing 500-600 people.
- 1939 –Romanian Prime Minister Armand Calinescu is assassinated by ultranationalist members of the Iron Guard.
- 1942 –In Poland, at the end of Yom Kippur, Germans order Jews to permanently evacuate Konstantynów and move to the Ghetto in Biała Podlaska, established to assemble Jews from seven nearby towns, including Janów Podlaski, Rossosz and Terespol.
- 1942 –The B-29 Superfortress makes its maiden flight.
- 1961 –Maiden flight of the CH-47 Chinook transportation helicopter.
- 1964 –Malta becomes independent from the United Kingdom.
- 1964 –The North American XB-70 Valkyrie, the world’s first Mach 3 bomber, makes its maiden flight from Palmdale, California.
- 1965 –Gambia, Maldives and Singapore are admitted as members of the United Nations.
- 1971 –Bahrain, Bhutan and Qatar join the United Nations.
- 1981 –Belize is granted full independence from the United Kingdom.
- 1984 –Brunei joins the United Nations.
- 1991 –Armenia is granted independence from Soviet Union.
- 1999 –Chi-Chi earthquake occurs in central Taiwan, leaving about 2,400 people dead.
- 2001 –America: A Tribute to Heroes is broadcast by over 35 network and cable channels, raising over $200 million for the September 11 attack victims.
- 2001 –Deep Space 1 flies within 2,200 km of Comet Borrelly.
- 2003 –Galileo mission is terminated by sending the probe into Jupiter’s atmosphere, where it is crushed by the pressure at the lower altitudes.
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