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.
||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]].
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.
||1650: William Bedloe born ... English spy.


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.


||1745 – Philippe Pinel, French physician and psychiatrist (d. 1826)
||1745: Philippe Pinel born ... physician and psychiatrist.


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]].
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.
||1809: James David Forbes born ... 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)
||1831: John Abernethy dies ... surgeon and anatomist.


||1836 – Eli Whitney Blake, Jr., American scientist and academic (d. 1895)
||1836: Eli Whitney Blake, Jr. born ... scientist and academic.


||1851 – Siegmund Lubin, Polish-American businessman, founded the Lubin Manufacturing Company (d. 1923)
||1851: Siegmund Lubin born ... businessman, founded the Lubin Manufacturing Company.


||1862 – Louis Pasteur and Claude Bernard complete the experiment falsifying the theory of spontaneous generation.
||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.
||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]].
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File:Tempest prognosticator.jpg|link=Tempest prognosticator (nonfiction)|1903: Leeches in [[Tempest prognosticator (nonfiction)|Tempest prognosticator]] go on strike, demanding "less tempest and more prognostication."
File:Tempest prognosticator.jpg|link=Tempest prognosticator (nonfiction)|1903: Leeches in [[Tempest prognosticator (nonfiction)|Tempest prognosticator]] go on strike, demanding "less tempest and more prognostication."


||Kai Manne Börje Siegbahn (b. 20 April 1918) was a Swedish physicist.
||1918: Kai Manne Börje Siegbahn born ... physicist.


||1918 – Karl Ferdinand Braun, German-American physicist and academic, Nobel Prize laureate (b. 1850)
||1918: Karl Ferdinand Braun dies ... physicist and academic, Nobel Prize laureate.


||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.
||1925: Eric Magnus Campbell Tigerstedt inventor ... 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
||1927: K. Alex Müller born ... Swiss physicist and academic, Nobel Prize laureate (alive August 2018).


||1928 – Robert Byrne, American chess player and author (d. 2013)
||1928: Robert Byrne born ... chess player and author.


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]].
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File:The Safe-Cracker.jpg|link=The Safe-Cracker|1933: Art critic and alleged time-traveller The Eel is [[The Safe-Cracker|caught in the act of cracking a safe]]''.
File:The Safe-Cracker.jpg|link=The Safe-Cracker|1933: Art critic and alleged time-traveller The Eel is [[The Safe-Cracker|caught in the act of cracking a safe]]''.


|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]].
||1933: Boris Lvovich Rosing dies ... scientist and inventor in the field of television Pic.


|George Oster (b. April 20, 1940) was an American mathematical biologist. No pic Wikipedia. See http://news.berkeley.edu/2018/04/20/george-oster-pioneer-in-applying-mathematics-to-biology-dies-at-77/
||1940: George Oster born ... mathematical biologist. No pic Wikipedia. See http://news.berkeley.edu/2018/04/20/george-oster-pioneer-in-applying-mathematics-to-biology-dies-at-77/


||1945 – Twenty Jewish children used in medical experiments at Neuengamme are killed in the basement of the Bullenhuser Damm school.
||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.
||1957: Konrad Hermann Theodor Knopp dies ... mathematician who worked on generalized limits and complex functions.


File:Baron Zersetzung.jpg|link=Baron Zersetzung|1960: Industrialist, public motivational speaker, and alleged crime boss [[Baron Zersetzung]] calls the upcoming [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs Invasion]] "a rock-solid business investment which is certain to generate handsome returns for early investors."
File:Baron Zersetzung.jpg|link=Baron Zersetzung|1960: Industrialist, public motivational speaker, and alleged crime boss [[Baron Zersetzung]] calls the upcoming [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs Invasion]] "a rock-solid business investment which is certain to generate handsome returns for early investors."
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|| Apollo 16 engineers decide if Apollo 16 should land on the moon group photo: https://commons.wikimedia.org/wiki/File:Apollo_16_meeting.jpg
|| Apollo 16 engineers decide if Apollo 16 should land on the moon group photo: https://commons.wikimedia.org/wiki/File:Apollo_16_meeting.jpg


||1972 – Apollo 16, commanded by John Young, lands on the moon.
||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,
||1992: Llewellyn Hilleth Thomas dies ... physicist and applied mathematician. He is best known for his contributions to atomic physics,


||Sigmund Selberg (b. 1994) was a Norwegian mathematician.
||1994: Sigmund Selberg born ... 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.  
||2001: David Gilbarg dies ... 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)
||2003: Bernard Katz dies ... biophysicist and academic, Nobel Prize laureate.


||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.
||2006: Mathematician and academic Paul Moritz Cohn cies ... author of many textbooks on algebra. His work was mostly in the area of algebra, especially non-commutative rings. Pic.


File:Two Creatures 6.jpg|link=Two Creatures 6 (nonfiction)|2018: Spectrographic analysis of ''[[Two Creatures 6 (nonfiction)|Two Creatures 6]]'' unexpectedly reveals previously unknown [[Color (nonfiction)|color]].
File:Two Creatures 6.jpg|link=Two Creatures 6 (nonfiction)|2018: Spectrographic analysis of ''[[Two Creatures 6 (nonfiction)|Two Creatures 6]]'' unexpectedly reveals previously unknown [[Color (nonfiction)|color]].


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Revision as of 18:20, 25 August 2018

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