About April 20

April 20, 2025 is the 110th day of the year 2025 in the Gregorian calendar. There are 255 days remaining until the end of this year. The day of the week is Sunday.

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

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

According to the lunisolar Chinese calendar, there are 303 days remaining before the start of the next Chinese New Year.

What Happened On April 20

  • 1323 –
    The University of Rome La Sapienza is instituted by Pope Boniface VIII.
  • 1453 –
    The last naval battle in Byzantine history occurs, as three Genoese galleys escorting a Byzantine transport fight their way through the huge Ottoman blockade fleet and into the Golden Horn.
  • 1534 –
    Jacques Cartier begins the voyage during which he discovers Canada and Labrador.
  • 1535 –
    The Sun dog phenomenon observed over Stockholm and depicted in the famous painting “Vädersolstavlan”.
  • 1689 –
    The former King James II of England, now deposed, lays siege to Derry.
  • 1770 –
    The Georgian king Erekle II, abandoned by his Russian ally Count Totleben, wins a victory over Ottoman forces at Aspindza.
  • 1810 –
    The Governor of Caracas declares independence from Spain.
  • 1818 –
    The case of Ashford v Thornton ends, with Abraham Thornton allowed to go free rather than face a retrial for murder, after his demand for trial by battle is upheld.
  • 1871 –
    The Civil Rights Act of 1871 becomes law.
  • 1884 –
    Pope Leo XIII publishes the encyclical Humanum Genus.
  • 1902 –
    Pierre and Marie Curie refine radium chloride.
  • 1908 –
    Opening day of competition in the New South Wales Rugby League.
  • 1914 –
    19 men, women, and children die in the Ludlow Massacre during a Colorado coal-miner’s strike.
  • 1918 –
    Manfred von Richthofen, aka The Red Baron, shoots down his 79th and 80th victims, his final victories before his death the following day.
  • 1946 –
    The League of Nations officially dissolves, giving most of its power to the United Nations.
  • 1968 –
    English politician Enoch Powell makes his controversial Rivers of Blood speech.
  • 1972 –
    Apollo 16, commanded by John Young, lands on the moon.
  • 1998 –
    German terrorist group the Red Army Faction announces their dissolution after 28 years.
  • 1999 –
    Columbine High School massacre: Eric Harris and Dylan Klebold kill 13 people and injure 24 others before committing suicide at Columbine High School in Jefferson County, Colorado.
  • 2010 –
    The Deepwater Horizon oil well explodes in the Gulf of Mexico, killing eleven workers and beginning an oil spill that would last five months.

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