About December 21

December 21, 2021 is the 355th day of the year 2021 in the Gregorian calendar. There are 10 days remaining until the end of this year. The day of the week is Tuesday.

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

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

According to the lunisolar Chinese calendar, there are 42 days remaining before the start of the next Chinese New Year.

December 21: More About This Day

This is a frequent day for the winter solstice to occur in the northern hemisphere and summer solstice to occur in the southern hemisphere.

What Happened On December 21

  • 1140
    Conrad III of Germany besieged Weinsberg.
  • 1598
    Battle of Curalaba: The revolting Mapuche, led by cacique Pelentaru, inflict a major defeat on Spanish troops in southern Chile.
  • 1620
    Plymouth Colony: William Bradford and the Mayflower Pilgrims land on what is now known as Plymouth Rock in Plymouth, Massachusetts.
  • 1832
    Egyptian–Ottoman War: Egyptian forces decisively defeat Ottoman troops at the Battle of Konya.
  • 1844
    The Rochdale Pioneers commence business at their cooperative in Rochdale, England, starting the Cooperative movement.
  • 1861
    Medal of Honor: Public Resolution 82, containing a provision for a Navy Medal of Valor, is signed into law by President Abraham Lincoln.
  • 1872
    Challenger expedition: HMS Challenger, commanded by Captain George Nares, sails from Portsmouth.
  • 1883
    The first Permanent Force cavalry and infantry regiments of the Canadian Army are formed: The Royal Canadian Dragoons and The Royal Canadian Regiment.
  • 1910
    An underground explosion at the Hulton Bank Colliery No. 3 Pit in Over Hulton, Westhoughton, England, kills 344 miners.
  • 1919
    American anarchist Emma Goldman is deported to Russia.
  • 1941
    World War II: A formal treaty of alliance between Thailand and Japan is signed in the presence of the Emerald Buddha in Wat Phra Kaew.
  • 1946
    An 8.1 Mw earthquake and subsequent tsunami in Nankaidō, Japan, kill over 1,300 people and destroy over 38,000 homes.
  • 1968
    Apollo program: Apollo 8 launched from the Kennedy Space Center, placing its crew on a lunar trajectory for the first visit to another celestial body by humans.
  • 1973
    The Geneva Conference on the Arab-Israeli conflict opens.
  • 1979
    Lancaster House Agreement: An independence agreement for Rhodesia is signed in London by Lord Carrington, Sir Ian Gilmour, Robert Mugabe, Joshua Nkomo, Bishop Abel Muzorewa and S.C. Mundawarara.
  • 1988
    A bomb explodes on board Pan Am flight 103 over Lockerbie, Dumfries and Galloway, Scotland, killing 270.
  • 1992
    A Dutch DC-10, flight Martinair MP 495, crashes at Faro Airport, killing 56 people.
  • 1994
    Mexican volcano Popocatepetl, dormant for 47 years, erupts gases and ash.
  • 1999
    The Spanish Civil Guard intercepts a van loaded with 950 kg of explosives that ETA intended to use to blow up Torre Picasso in Madrid.
  • 2004
    Iraq War: A suicide bomber killed 22 at the forward operating base next to the main U.S. military airfield at Mosul, the single deadliest suicide attack on American soldiers.

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