Template:Selected anniversaries/April 20: Difference between revisions
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||1535 – The sun dog phenomenon observed over Stockholm and depicted in the famous painting Vädersolstavlan. | |||
||1650 – William Bedloe, English spy born. | ||1650 – William Bedloe, English spy born. | ||
File:Oliver Cromwell by Samuel Cooper.jpg|link=Oliver Cromwell (nonfiction)|1653: [[Oliver Cromwell (nonfiction)|Oliver Cromwell]] dissolves the Rump Parliament. | File:Oliver Cromwell by Samuel Cooper.jpg|link=Oliver Cromwell (nonfiction)|1653: [[Oliver Cromwell (nonfiction)|Oliver Cromwell]] dissolves the Rump Parliament. | ||
File:Niels Steensen.png|link=Niels Steensen (nonfiction)|1654: Mathematician [[Niels Steensen (nonfiction)|Niels Steensen]] publishes new class of [[Gnomon algorithm functions]] which detect and prevent [[crimes against mathematical constants]]. | File:Niels Steensen.png|link=Niels Steensen (nonfiction)|1654: Mathematician [[Niels Steensen (nonfiction)|Niels Steensen]] publishes new class of [[Gnomon algorithm functions]] which detect and prevent [[crimes against mathematical constants]]. | ||
||James David Forbes FRS FRSE FGS (20 April 1809 | ||1745 – Philippe Pinel, French physician and psychiatrist (d. 1826) | ||
||James David Forbes FRS FRSE FGS (b. 20 April 1809) was a Scottish physicist and glaciologist who worked extensively on the conduction of heat and seismology. He invented the seismometer. | |||
||1831 – John Abernethy, English surgeon and anatomist (b. 1764) | |||
||1836 – Eli Whitney Blake, Jr., American scientist and academic (d. 1895) | |||
||1851 – Siegmund Lubin, Polish-American businessman, founded the Lubin Manufacturing Company (d. 1923) | |||
||1862 – Louis Pasteur and Claude Bernard complete the experiment falsifying the theory of spontaneous generation. | |||
||1865 – Astronomer Angelo Secchi demonstrates the Secchi disk, which measures water clarity, aboard Pope Pius IX's yacht, the L'Immaculata Concezion. | |||
||1902 – Pierre and Marie Curie refine radium chloride. | |||
||Kai Manne Börje Siegbahn (b. 20 April 1918) was a Swedish physicist. | |||
||1918 – Karl Ferdinand Braun, German-American physicist and academic, Nobel Prize laureate (b. 1850) | |||
||1927 – K. Alex Müller, Swiss physicist and academic, Nobel Prize laureate | |||
||1928 – Robert Byrne, American chess player and author (d. 2013) | |||
File:Giuseppe Peano.jpg|link=Giuseppe Peano (nonfiction)|1932: Mathematician [[Giuseppe Peano (nonfiction)|Giuseppe Peano]] dies. He did pioneering work in mathematical logic and [[Set theory (nonfiction)|set theory]]. | File:Giuseppe Peano.jpg|link=Giuseppe Peano (nonfiction)|1932: Mathematician [[Giuseppe Peano (nonfiction)|Giuseppe Peano]] dies. He did pioneering work in mathematical logic and [[Set theory (nonfiction)|set theory]]. | ||
File:Exponential-growth-diagram.svg|link=Crimes against mathematical constants|1932: New class of [[crimes against mathematical constants]] exploits death of mathematician [[Giuseppe Peano (nonfiction)|Giuseppe Peano]]. | File:Exponential-growth-diagram.svg|link=Crimes against mathematical constants|1932: New class of [[crimes against mathematical constants]] exploits death of mathematician [[Giuseppe Peano (nonfiction)|Giuseppe Peano]]. | ||
||1945 – Twenty Jewish children used in medical experiments at Neuengamme are killed in the basement of the Bullenhuser Damm school. | |||
File:Bay of Pigs.jpg|link=Bay of Pigs Invasion (nonfiction)|1961: Failure of the [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs Invasion]] of US-backed Cuban exiles against Cuba. | File:Bay of Pigs.jpg|link=Bay of Pigs Invasion (nonfiction)|1961: Failure of the [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs Invasion]] of US-backed Cuban exiles against Cuba. | ||
||1972 – Apollo 16, commanded by John Young, lands on the moon. | |||
||2003 – Bernard Katz, German-English biophysicist and academic, Nobel Prize laureate (b. 1911) | |||
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Revision as of 11:27, 29 October 2017
1653: Oliver Cromwell dissolves the Rump Parliament.
1654: Mathematician Niels Steensen publishes new class of Gnomon algorithm functions which detect and prevent crimes against mathematical constants.
1932: Mathematician Giuseppe Peano dies. He did pioneering work in mathematical logic and set theory.
1932: New class of crimes against mathematical constants exploits death of mathematician Giuseppe Peano.
1961: Failure of the Bay of Pigs Invasion of US-backed Cuban exiles against Cuba.