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)
- 1680 –Pueblo Indians capture Santa Fe from Spanish during the Pueblo Revolt.
- 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.
- 1808 –Battle of Vimeiro: British and Portuguese forces led by General Arthur Wellesley defeat French force under Major-General Jean-Andoche Junot near the village of Vimeiro, Portugal, the first Anglo-Portuguese victory of the Peninsular War.
- 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.
- 1911 –The Mona Lisa is stolen by a Louvre employee.
- 1944 –World War II: Canadian and Polish units capture the strategically important town of Falaise, France.
- 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.
- 1963 –Xa Loi Pagoda raids: the Army of the Republic of Vietnam Special Forces loyal to Ngo Dinh Nhu, brother of President Ngo Dinh Diem, vandalises Buddhist pagodas across the country, arresting thousands and leaving an estimated hundreds dead.
- 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.
- 1971 –A bomb exploded in the Liberal Party campaign rally in Plaza Miranda, Manila, Philippines with several anti-Marcos political candidates injured.
- 1976 –Operation Paul Bunyan at Panmunjeom, Korea.
- 1986 –Carbon dioxide gas erupts from volcanic Lake Nyos in Cameroon, killing up to 1,800 people within a 20-kilometer range.
- 1991 –Coup attempt against Mikhail Gorbachev collapses.
- 1992 –Ruby Ridge Standoff in Idaho
- 1993 –NASA loses contact with the Mars Observer spacecraft.
- 2007 –Hurricane Dean makes its first landfall in Costa Maya, Mexico with winds at 165 mph. Dean is the first storm since Hurricane Andrew to make landfall as a Category 5.
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