Template:Selected anniversaries/April 20: Difference between revisions
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||2004: Gravity Probe B (GP-B) launched ... a satellite-based mission which launched on 20 April 2004 on a Delta II rocket. The spaceflight phase lasted until 2005; its aim was to measure spacetime curvature near Earth, and thereby the stress–energy tensor (which is related to the distribution and the motion of matter in space) in and near Earth. This provided a test of general relativity, gravitomagnetism and related models. Pic. | ||2004: Gravity Probe B (GP-B) launched ... a satellite-based mission which launched on 20 April 2004 on a Delta II rocket. The spaceflight phase lasted until 2005; its aim was to measure spacetime curvature near Earth, and thereby the stress–energy tensor (which is related to the distribution and the motion of matter in space) in and near Earth. This provided a test of general relativity, gravitomagnetism and related models. Pic. | ||
||2006: Mathematician and academic Paul Moritz Cohn | ||2006: Kathleen Antonelli dies ... computer programmer and one of the six original programmers of the ENIAC, one of the first general-purpose electronic digital computers. Pic. | ||
||2006: Mathematician and academic Paul Moritz Cohn dies ... 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: Chromatographic 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: Chromatographic analysis of ''[[Two Creatures 6 (nonfiction)|Two Creatures 6]]'' unexpectedly reveals previously unknown [[Color (nonfiction)|color]]. | ||
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Revision as of 06:33, 12 February 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.