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. Pic (lovely). | ||
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]]. | ||
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||1809: James David Forbes born ... physicist and glaciologist who worked extensively on the conduction of heat and seismology. He invented the seismometer. Pic. | ||1809: James David Forbes born ... physicist and glaciologist who worked extensively on the conduction of heat and seismology. He invented the seismometer. Pic. | ||
||1831: John Abernethy dies ... surgeon and anatomist. | ||1831: John Abernethy dies ... surgeon and anatomist. His ''Surgical Observations on the Constitutional Origin and Treatment of Local Diseases'' (1809) — known as "My Book", from the great frequency with which he referred his patients to it, and to page 72 of it in particular, under that name — was one of the earliest popular works on medical science. So great was his zeal in encouraging patients to read the book that he earned the nickname "Doctor My-Book". Pic. | ||
||1836: Eli Whitney Blake, Jr. born ... scientist and academic. | ||1836: Eli Whitney Blake, Jr. born ... scientist and academic. | ||
Revision as of 11:38, 17 April 2019
1548: Mathematician, astronomer, and alleged time-traveller Petrus Apianus publishes Cosmographicus furatis, his magisterial treatise on crimes against astronomical constants.
1653: Oliver Cromwell dissolves the Rump Parliament.
1790: Mathematician and detective Johann Friedrich Pfaff uses partial differential equations of the first order Pfaffian systems to track and erase the Forbidden Ratio.
1902: Pierre and Marie Curie refine radium chloride.
1903: Leeches in Tempest prognosticator go on strike, demanding "less tempest and more prognostication."
1932: Mathematician Giuseppe Peano dies. He did pioneering work in mathematical logic and set theory.
1933: Art critic and alleged time-traveller The Eel is caught in the act of cracking a safe.
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.
1960: Industrialist, public motivational speaker, and alleged crime boss Baron Zersetzung calls the upcoming Bay of Pigs Invasion "a rock-solid business investment which is certain to generate handsome returns for early investors."
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.
2018: Chromatographic analysis of Two Creatures 6 unexpectedly reveals previously unknown color.