About August 21

August 21, 2025 is the 233rd day of the year 2025 in the Gregorian calendar. There are 132 days remaining until the end of this year. The day of the week is Thursday.

You can browse the full year calendar in case you need it.

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Leo is the sun sign of a person born on this day. Peridot is the modern birthstone for this month. Diamond is the mystical birthstone from Tibetan origin that dates back over a thousand years.

According to the lunisolar Chinese calendar, there are 180 days remaining before the start of the next Chinese New Year.

What Happened On August 21

  • 1192
    Minamoto Yoritomo becomes Seii Tai Shōgun and the de facto ruler of Japan. (Traditional Japanese date: July 12, 1192)
  • 1331
    King Stephen Uroš III, after months of anarchy, surrenders to his son and rival Stephen Dušan, who succeeds as King of Serbia.
  • 1689
    The Battle of Dunkeld in Scotland.
  • 1770
    James Cook formally claims eastern Australia for Great Britain, naming it New South Wales.
  • 1772
    King Gustav III completes his coup d'état by adopting a new Constitution, ending half a century of parliamentary rule in Sweden and installing himself as an enlightened despot.
  • 1778
    American Revolutionary War: British forces begin besieging the French outpost at Pondicherry.
  • 1821
    Jarvis Island is discovered by the crew of the ship, Eliza Frances.
  • 1831
    Nat Turner leads black slaves and free blacks in a rebellion.
  • 1863
    Lawrence, Kansas is destroyed by Confederate guerrillas Quantrill’s Raiders in the Lawrence Massacre.
  • 1879
    The Virgin Mary, along with St. Joseph and St. John the Evangelist, reportedly appears at Knock Shrine in Knock, County Mayo, Ireland.
  • 1888
    The first successful adding machine in the United States is patented by William Seward Burroughs.
  • 1918
    World War I: The Second Battle of the Somme begins.
  • 1942
    World War II: a Nazi flag is installed atop the Mount Elbrus.
  • 1944
    Dumbarton Oaks Conference, prelude to the United Nations, begins.
  • 1945
    Physicist Harry K. Daghlian, Jr. is fatally irradiated in a criticality incident during an experiment with the Demon core at Los Alamos National Laboratory.
  • 1969
    An Australian, Michael Dennis Rohan, sets the Al-Aqsa Mosque on fire, a major catalyst of the formation of the Organisation of Islamic Cooperation.
  • 1976
    Operation Paul Bunyan at Panmunjeom, Korea.
  • 1979
    Soviet dancer Alexander Godunov defects to the United States.
  • 1982
    Lebanese Civil War: The first troops of a multinational force lands in Beirut to oversee the Palestine Liberation Organization’s withdrawal from Lebanon.
  • 1991
    Latvia declares renewal of its full independence after the occupation of Soviet Union.

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