About December 20

December 20, 2025 is the 354th day of the year 2025 in the Gregorian calendar. There are 11 days remaining until the end of this year. The day of the week is Saturday.

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 59 days remaining before the start of the next Chinese New Year.

What Happened On December 20

  • 217
    The papacy of Zephyrinus ends. Callixtus I is elected as the sixteenth pope, but is opposed by the theologian Hippolytus who accuses him of laxity and of being a Modalist, one who denies any distinction between the three persons of the Trinity.
  • 1192
    Richard the Lion-Heart is captured and imprisoned by Leopold V of Austria on his way home to England after signing a treaty with Saladin ending the Third crusade.
  • 1522
    Siege of Rhodes: Suleiman the Magnificent accepts the surrender of the surviving Knights of Rhodes, who are allowed to evacuate. They eventually settle on Malta and become known as the Knights of Malta.
  • 1803
    The Louisiana Purchase is completed at a ceremony in New Orleans.
  • 1808
    Peninsular War: The Siege of Zaragoza begins.
  • 1915
    World War I: Last Australian troops evacuated from Gallipoli.
  • 1941
    World War II: First battle of the American Volunteer Group, better known as the “Flying Tigers” in Kunming, China.
  • 1942
    World War II: Bombing of Calcutta by the Japanese.
  • 1951
    The EBR-1 in Arco, Idaho becomes the first nuclear power plant to generate electricity. The electricity powered four light bulbs.
  • 1952
    United States Air Force C-124 crashes and burns in Moses Lake, Washington killing 87.
  • 1955
    Cardiff is proclaimed the capital city of Wales, United Kingdom.
  • 1960
    National Front for the Liberation of Vietnam is formed.
  • 1968
    The Zodiac Killer kills Betty Lou Jenson and David Faraday in Vallejo, California.
  • 1977
    Djibouti and Vietnam join the United Nations.
  • 1984
    The Summit tunnel fire is the largest underground fire in history, as a freight train carrying over 1 million litres of petrol derails near the town of Todmorden in the Pennines.
  • 1987
    History’s worst peacetime sea disaster, when the passenger ferry Doña Paz sinks after colliding with the oil tanker Vector 1 in the Tablas Strait in the Philippines, killing an estimated 4,000 people (1,749 official).
  • 1988
    The United Nations Convention Against Illicit Traffic in Narcotic Drugs and Psychotropic Substances is signed in Vienna.
  • 1995
    NATO begins peacekeeping in Bosnia.
  • 2004
    A gang of thieves steal £26.5 million worth of currency from the Donegall Square West headquarters of Northern Bank in Belfast, Northern Ireland, one of the largest bank robberies in UK history.
  • 2005
    In Durrës, Albania was founded Aleksander Moisiu University.

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