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.

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 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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