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August 20
in history

Pluto first appears on photographic plates at Yerkes Observatory (1909), and Estonia restores its independence on legal continuity grounds (1991). Born on this day: Benjamin Harrison, Andrew Garfield and Mohamed Morsi. Died: St. Pius X, Pius VII and Paul Ehrlich.

31 events, 64 births and 51 deaths on this date.

1909

Pluto first appears on photographic plates at Yerkes Observatory

Pluto was captured on photographic plates at Yerkes Observatory in Wisconsin, 21 years before Clyde Tombaugh formally discovered it. Tombaugh's search in 1930 is what finally brought the distant world to wider attention.

NASA/JHUAPL/SwRI · Public domain

Events

  1. 1991

    Estonia restores its independence on legal continuity grounds

    Estonia declared that its statehood had never lapsed, so its independence was re-established rather than newly created. The claim rested on the pre-1940 state, which had been occupied and annexed by the Soviet Union but never legally dissolved.

  2. 1948

    United States expels Soviet consul general in New York

    Washington ordered Jacob Lomakin, the Soviet consul general in New York, out of the country over the Kasenkina case. The affair was a bitter dispute between Washington and Moscow early in the Cold War.

  3. 1858

    Darwin and Wallace present natural selection to the Linnean Society

    On this day the Linnean Society published Charles Darwin's theory of evolution by natural selection alongside a paper by Alfred Russel Wallace reaching the same conclusion. Their joint presentation is how the idea first reached the scientific world in print.

  4. 1910

    Devil's Broom fire burns across Washington and Idaho

    Strong gales fanned hundreds of small blazes into one enormous wildfire across Washington and Idaho. It scorched roughly 4,700 square miles, making it the biggest fire the United States has on record.

  5. 2002

    Iraqi dissidents seize Iraq's embassy in Berlin

    A small group of Iraqi opponents of Saddam Hussein's government occupied the embassy for about five hours. They freed their hostages and gave themselves up, ending the standoff peacefully.

  6. 1866

    President Johnson declares the American Civil War over

    In the app
  7. 1308

    Papal investigators issue the Chinon Parchment on Templar leaders

    In the app
  8. 14

    Augustus's grandson Agrippa Postumus killed in exile

    In the app

25 more events on August 20

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Born on August 20

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  • Benjamin Harrison
    1833 – 1901 · Politician

    Benjamin Harrison

    Benjamin Harrison was the 23rd US president, serving from 1889 to 1893, and the grandson of the ninth president, William Henry Harrison. He is remembered for signing the Sherman Antitrust Act and the McKinley Tariff, and for losing the 1892 election to Grover Cleveland, his predecessor.

    Pach Brothers · Public domain
  • Andrew Garfield
    1983 · Film actor

    Andrew Garfield

    English and American actor known for playing Spider-Man in Marc Webb's films and for his Oscar-nominated turns in Hacksaw Ridge and Tick, Tick... Boom!. He broke through with The Social Network and Never Let Me Go.

    Raph_PH · CC BY 4.0
  • Mohamed Morsi
    1951 – 2019 · Politician

    Mohamed Morsi

    Egypt's fifth president, he was removed from office after about a year in power, following mass protests against his rule. Trained as a metallurgical engineer, he had also taught at universities in California and Egypt before entering politics.

    Wilson Dias/ABr · CC BY 3.0 br

Died on August 20

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  • St. Pius X
    1835 – 1914 · Catholic priest

    St. Pius X

    Giuseppe Sarto, born poor in the Austrian Empire, became Pope Pius X and fought modernist readings of Catholic doctrine. He died in 1914 and was later declared a saint for lowering the age of First Communion and encouraging frequent communion.

    Ernest Walter Histed · Public domain
  • Pius VII
    1742 – 1823 · Catholic priest

    Pius VII

    Pius VII led the Catholic Church for over twenty-three years, through Napoleon's rise. He had been taken prisoner by Napoleon's forces and held in France, before returning to Rome in 1814 to a warm welcome.

    Jacques-Louis David · Public domain
  • Paul Ehrlich
    1854 – 1915 · Immunologist

    Paul Ehrlich

    Paul Ehrlich was a German physician whose work on immunity earned him a Nobel Prize in 1908. He is remembered for Salvarsan, the first effective treatment for syphilis, and for coining the term chemotherapy.

    Eduard Blum · CC BY 4.0

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