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.
File:Petrus Apianus.jpg|link=Petrus Apianus (nonfiction)|1548: Mathematician, astronomer, and alleged time-traveller [[Petrus Apianus (nonfiction)|Petrus Apianus]] publishes ''Cosmographicus furatis'', his magisterial treatise on [[crimes against astronomical constants]].
||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.
||1745 – Philippe Pinel, French physician and psychiatrist (d. 1826)
File:Johann Friedrich Pfaff.jpg|link=Johann Friedrich Pfaff (nonfiction)|1790: Mathematician and detective [[Johann Friedrich Pfaff (nonfiction)|Johann Friedrich Pfaff]] uses partial differential equations of the first order Pfaffian systems to track and erase the [[Forbidden Ratio]].
||James David Forbes (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.
File:Curie_and_radium_by_Castaigne.jpg|link=Radium (nonfiction)|1902: Pierre and Marie Curie refine [[Radium (nonfiction)|radium chloride]].
File:Curie_and_radium_by_Castaigne.jpg|link=Radium (nonfiction)|1902: Pierre and Marie Curie refine [[Radium (nonfiction)|radium chloride]].


||Kai Manne Börje Siegbahn (b. 20 April 1918) was a Swedish physicist.
File:Karl Ferdinand Braun.jpg|link=Karl Ferdinand Braun (nonfiction)|1918: Physicist and academic [[Karl Ferdinand Braun (nonfiction)|Karl Ferdinand Braun]] dies. Braun contributed significantly to the development of radio and television technology, sharing the 1909 Nobel Prize in Physics with [[Guglielmo Marconi (nonfiction)|Guglielmo Marconi]] "for their contributions to the development of wireless telegraphy".
 
||1918 – Karl Ferdinand Braun, German-American physicist and academic, Nobel Prize laureate (b. 1850)
 
||Eric Magnus Campbell Tigerstedt (d. April 20, 1925) was one of the most significant inventors in Finland at the beginning of the 20th century and has been called the "Thomas Edison of Finland". He was a pioneer of sound-on-film technology and made significant improvements to the amplification capacity of the vacuum valve. Pic.
 
||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]].
||1945 – Twenty Jewish children used in medical experiments at Neuengamme are killed in the basement of the Bullenhuser Damm school.


File:Georg_Feigl.jpg|link=Georg Feigl (nonfiction)|1945: Mathematician [[Georg Feigl (nonfiction)|Georg Feigl]] dies. He worked on the foundations of geometry and topology, studying fixed point theorems for ''n''-dimensional manifolds. Feigl was one of the initial authors of the ''Mathematisches Wörterbuch''.
File:Georg_Feigl.jpg|link=Georg Feigl (nonfiction)|1945: Mathematician [[Georg Feigl (nonfiction)|Georg Feigl]] dies. He worked on the foundations of geometry and topology, studying fixed point theorems for ''n''-dimensional manifolds. Feigl was one of the initial authors of the ''Mathematisches Wörterbuch''.
||Konrad Hermann Theodor Knopp (d. 1957) was a German mathematician who worked on generalized limits and complex functions.


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.


File:Clandestiphrine proposal.jpg|link=Clandestiphrine|1962: Traces of [[Clandestiphrine]] residue are detected at the [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs]], raising questions about CIA involvement with [[transdimensional drugs]].
File:Clandestiphrine proposal.jpg|link=Clandestiphrine|1962: Traces of [[Clandestiphrine]] residue are detected at the [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs]], raising questions about CIA involvement with [[transdimensional drugs]].
||1972 – Apollo 16, commanded by John Young, lands on the moon.
||Llewellyn Hilleth Thomas (d. 20 April 1992) was a British physicist and applied mathematician. He is best known for his contributions to atomic physics,
||Sigmund Selberg (b. 1994) was a Norwegian mathematician.
||David Gilbarg (d. 20 April 2001) was an American mathematician, and a professor emeritus at Stanford University. Gilbarg was co-author, together with his student Neil Trudinger, of the book Elliptic Partial Differential Equations of Second Order.
||2003 – Bernard Katz, German-English biophysicist and academic, Nobel Prize laureate (b. 1911)
||Paul Moritz Cohn (d. 20 April 2006) was Astor Professor of Mathematics at University College London, 1986-9, and author of many textbooks on algebra. His work was mostly in the area of algebra, especially non-commutative rings. Pic.


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Latest revision as of 04:59, 21 April 2022

  • 1902: Pierre and Marie Curie refine radium chloride.

    1902: Pierre and Marie Curie refine radium chloride.

  • 1918: Physicist and academic Karl Ferdinand Braun dies. Braun contributed significantly to the development of radio and television technology, sharing the 1909 Nobel Prize in Physics with Guglielmo Marconi "for their contributions to the development of wireless telegraphy".

    1918: Physicist and academic Karl Ferdinand Braun dies. Braun contributed significantly to the development of radio and television technology, sharing the 1909 Nobel Prize in Physics with Guglielmo Marconi "for their contributions to the development of wireless telegraphy".

  • 1932: Mathematician Giuseppe Peano dies. He did pioneering work in mathematical logic and set theory.

    1932: Mathematician Giuseppe Peano dies. He did pioneering work in mathematical logic and set theory.

  • 1945: Mathematician Georg Feigl dies. He worked on the foundations of geometry and topology, studying fixed point theorems for n-dimensional manifolds. Feigl was one of the initial authors of the Mathematisches Wörterbuch.

    1945: Mathematician Georg Feigl dies. He worked on the foundations of geometry and topology, studying fixed point theorems for n-dimensional manifolds. Feigl was one of the initial authors of the Mathematisches Wörterbuch.

  • 1961: Failure of the Bay of Pigs Invasion of US-backed Cuban exiles against Cuba.

    1961: Failure of the Bay of Pigs Invasion of US-backed Cuban exiles against Cuba.

  • 1962: Traces of Clandestiphrine residue are detected at the Bay of Pigs, raising questions about CIA involvement with transdimensional drugs.

    1962: Traces of Clandestiphrine residue are detected at the Bay of Pigs, raising questions about CIA involvement with transdimensional drugs.

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