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

  • 69
    The Roman Senate declares Vespasian as Roman emperor, the last in the Year of Four Emperors.
  • 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.
  • 1826
    American settlers in Nacogdoches, Mexican Texas, declare their independence, starting the Fredonian Rebellion.
  • 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.
  • 1879
    World première of Henrik Ibsen’s A Doll’s House at the Royal Theatre in Copenhagen.
  • 1883
    The first Permanent Force cavalry and infantry regiments of the Canadian Army are formed: The Royal Canadian Dragoons and The Royal Canadian Regiment.
  • 1907
    The Chilean Army commits a massacre of at least 2,000 striking saltpeter miners in in Iquique, Chile.
  • 1919
    American anarchist Emma Goldman is deported to Russia.
  • 1937
    Snow White and the Seven Dwarfs, the world’s first full-length animated feature, premieres at the Carthay Circle Theater.
  • 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.
  • 1967
    Louis Washkansky, the first man to undergo a heart transplant, dies in Cape Town, South Africa, after living for 18 days after the transplant.
  • 1969
    The United Nations adopts the Convention on the Elimination of All Forms of Racial Discrimination.
  • 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.
  • 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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