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| File:Leonardo by Meizi.jpg|link=Leonardo da Vinci (nonfiction)|1452: Polymath [[Leonardo da Vinci (nonfiction)|Leonardo da Vinci]] born. His areas of interest will include painting, sculpting, architecture, invention, science, music, mathematics, engineering, literature, anatomy, geology, astronomy, botany, writing, history, and cartography. | | File:Leonardo by Meizi.jpg|link=Leonardo da Vinci (nonfiction)|1452: Polymath [[Leonardo da Vinci (nonfiction)|Leonardo da Vinci]] born. His areas of interest will include painting, sculpting, architecture, invention, science, music, mathematics, engineering, literature, anatomy, geology, astronomy, botany, writing, history, and cartography. |
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| File:Leonardo_da_Vinci_in_flight.jpg|link=Leonardo da Vinci|1488: Polymath [[Leonardo da Vinci]] publishes groundbreaking treatise on applications of the [[Gnomon algorithm]] principle to powered flight. | | File:Leonardo_da_Vinci_in_flight.jpg|link=Leonardo da Vinci|1488: Polymath [[Leonardo da Vinci]] publishes groundbreaking treatise on applications of the [[Gnomon algorithm]] principle to powered flight. |
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| ||1552: Pietro Cataldi born ... mathematician and astronomer. Pic: book cover. | | File:Due_lettioni_date_nella_academia_erigenda_dove_si_mostra_come_si_trovi_la_grandezza_delle_superficie_rettilinee.jpg|link=Pietro Cataldi (nonfiction)|1552: Mathematician and astronomer [[Pietro Cataldi (nonfiction)|Pietro Cataldi]] born. Cataldi will contribute to the development of continued fractions and a method for their representation; he will also discover the sixth and seventh perfect numbers by 1588. |
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| ||1641: Robert Sibbald born ... physician and antiquary. Pic. | |
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| ||1704: Johannes Hudde dies ... burgomaster (mayor) of Amsterdam between 1672 – 1703, a mathematician and governor of the Dutch East India Company. He is the namesake of Hudde's rules regarding two properties of polynomial roots. Pic.
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| File:Leonhard Euler.jpg|link=Leonhard Euler (nonfiction)|1707: Mathematician and physicist [[Leonhard Euler (nonfiction)|Leonhard Euler]] born. He will make important and influential discoveries in many branches of mathematics, and will introduce much of the modern mathematical terminology and notation, such as the notion of a mathematical function. | | File:Leonhard Euler.jpg|link=Leonhard Euler (nonfiction)|1707: Mathematician and physicist [[Leonhard Euler (nonfiction)|Leonhard Euler]] born. He will make important and influential discoveries in many branches of mathematics, and will introduce much of the modern mathematical terminology and notation, such as the notion of a mathematical function. |
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| File:San Pietro scrying engine.png|link=San Pietro scrying engine|1707: The [[San Pietro scrying engine]] spontaneously generates birthday greetings for the newborn [[Leonhard Euler (nonfiction)|Leonhard Euler]].
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| ||1710: William Cullen born ... physician and chemist ... Enlightenment figure. Pic.
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| ||1730: Felice Fontana born ... physicist who discovered the water gas shift reaction in 1780. He is also credited with launching modern toxicology and investigating the human eye. Pic.
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| ||1754: Jacopo Riccati born ... mathematician and academic. Pic.
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| ||1755: Samuel Johnson's ''A Dictionary of the English Language'' is published in London.
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| File:Peder Horrebow.jpg|link=Peder Horrebow (nonfiction)|1764: Astronomer and mathematician [[Peder Horrebow (nonfiction)|Peder Horrebow]] dies. he invent a way to determine a place's latitude from the stars. | | File:Peder Horrebow.jpg|link=Peder Horrebow (nonfiction)|1764: Astronomer and mathematician [[Peder Horrebow (nonfiction)|Peder Horrebow]] dies. he invent a way to determine a place's latitude from the stars. |
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| ||1765: Mikhail Lomonosov dies ... chemist and physicist. Pic.
| | File:Ernst_Ruhmer,_Technical_World_cover_(1905).jpg|link=Ernst Ruhmer (nonfiction)|1878: Physicist [[Ernst Ruhmer (nonfiction)|Ernst Ruhmer]] born. Ruhmer will invent applications for the light-sensitivity properties of selenium, including wireless telephony using line-of-sight optical transmissions, sound-on-film audio recording, and television transmissions over wires. |
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| ||1793: Ignacije Szentmartony dies ... priest, mathematician, and astronomer. Pic search dubious: https://www.google.com/search?q=Ignacije+Szentmartony
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| ||1793: Friedrich Georg Wilhelm von Struve born ... astronomer and geodesist from the famous Struve family. He is best known for studying double stars and for initiating a triangulation survey later named Struve Geodetic Arc in his honor.
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| File:A la mémoire de J.M. Jacquard.jpg|link=Joseph Marie Jacquard (nonfiction)|1805: Emperor grants the patent for Jacquard’s loom to the city of Lyon. In return, Jacquard received a lifelong pension of 3,000 francs.
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| ||1809: Hermann Günther Grassmann born ... polymath, known in his day as a linguist and now also as a mathematician. He was also a physicist, neohumanist, general scholar, and publisher.
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| ||1819: Oliver Evans dies ... inventor, engineer and businessman born in rural Delaware and later rooted commercially in Philadelphia. He was one of the first Americans building steam engines and an advocate of high pressure steam (vs. low pressure steam). A pioneer in the fields of automation, materials handling and steam power, Evans was one of the most prolific and influential inventors in the early years of the United States. Pic.
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| ||1833: Maurice (Moritz) Loewy born ... astronomer.
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| ||1853: Auguste Laurent dies ... chemist who helped in the founding of organic chemistry with his discoveries of anthracene, phthalic acid, and carbolic acid. He devised a systematic nomenclature for organic chemistry based on structural grouping of atoms within molecules to determine how the molecules combine in organic reactions. Pic.
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| File:Johann Philipp Reis.jpg|link=|1854: Scientist and inventor [[Johann Philipp Reis (nonfiction)|Johann Philipp Reis]] uses [[scrying engine]] technology to fight [[crimes against mathematical constants]].
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| ||1854: Arthur Aikin dies ... chemist and mineralogist. Pic.
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| ||1874: Johannes Stark born ... physicist and academic, Nobel Prize laureate.
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| File:Ernst_Ruhmer,_Technical_World_cover_(1905).jpg|link=Ernst Ruhmer (nonfiction)|1878: Physicist [[Ernst Ruhmer (nonfiction)|Ernst Ruhmer]] born. He will invent applications for the light-sensitivity properties of selenium, including wireless telephony using line-of-sight optical transmissions, sound-on-film audio recording, and television transmissions over wires. | |
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| ||1883: Vladimir Onufrievich Kovalevsky dies ... academic and paleontologist. Pic.
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| ||1885: Emory Leon Chaffee born ... physicist and a former professor at Harvard University from 1911 to 1953. Pic.
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| ||1892: Corrie ten Boom born ... clocksmith Nazi resister, and author.
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| ||1896: Nikolay Semyonov born ... physicist and chemist, Nobel Prize laureate.
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| ||1910: Miguel Najdorf born ... chess player and theoretician.
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| File:Johannes Bosscha.jpg|link=Johannes Bosscha (nonfiction)|1911: Physicist [[Johannes Bosscha (nonfiction)|Johannes Bosscha Jr.]] dies. He made important investigations on galvanic polarization and the rapidity of sound waves; he was one of the first (1855) to suggest the possibility of sending two messages simultaneously over the same wire.
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| ||1920: Godfrey Stafford born ... physicist and academic.
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| ||1922: U.S. Senator John B. Kendrick of Wyoming introduces a resolution calling for an investigation of a secret land deal, which leads to the discovery of the Teapot Dome scandal.
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| ||1923: Robert DePugh born ... activist, founded the Minutemen (an anti-Communist organization).
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| File:Rosalind Franklin.jpg|link=Rosalind Franklin (nonfiction)|1925: Chemist, X-ray crystallographer, and crime-fighter [[Rosalind Franklin (nonfiction)|Rosalind Franklin]] publishes [[Gnomon algorithm]] model which anticipates the use of DNA (deoxyribonucleic acid) to detect and prevent [[Crimes against chemical constants|crimes against chemistry]].
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| File:Charles Lindbergh.jpg|link=File:Charles Lindbergh.jpg|1926: Aviator [[Charles Lindbergh (nonfiction)|Charles Lindbergh]] opens service on the newly designated 278-mile (447 km) Contract Air Mail Route #2 (CAM-2) to provide service between St. Louis and Chicago (Maywood Field) with two intermediate stops in Springfield and Peoria, Illinois.
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| ||1927: Robert Mills born ... physicist and academic.
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| ||1929: Thomas Brooke Benjamin born ... mathematical physicist and mathematician, best known for his work in mathematical analysis and fluid mechanics, especially in applications of nonlinear differential equations. Pic.
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| ||1952: Alexander Crichton Mitchell dies ... physicist with a special interest in geomagnetics who worked for many years in India as a professor and head of a meteorological observatory before returning to Scotland. He then worked with the Royal Navy to devise a system, known as an anti-submarine indicator loop, for detecting submarines by detecting currents induced in a loop of wire on the sea floor. Pic: http://indicatorloops.com/mitchell.htm
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| File:Edward Lorenz.jpg|link=Edward Lorenz (nonfiction)|1983: Mathematician and alleged time-traveller [[Edward Lorenz (nonfiction)|Edward Lorenz]] publishes new class of [[Gnomon algorithm]] functions which use the butterfly effect to detect and prevent [[crimes against mathematical constants]].
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| ||1984: Grete (Henry-)Hermann dies ... mathematician and philosopher noted for her work in mathematics, physics, philosophy and education. She is noted for her early philosophical work on the foundations of quantum mechanics, and is now known most of all for an early, but long-ignored refutation of a no-hidden-variable theorem by John von Neumann. Pic.
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| ||1992: Hans Maass dies ... mathematician who introduced Maass wave forms (Maass 1949) and Koecher–Maass series (Maass 1950) and Maass–Selberg relations and who proved most of the Saito–Kurokawa conjecture. Pic.
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| ||1992: Otis Barton dies ... diver, engineer, and actor, designed the bathysphere. Pic (cool).
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| ||1993: John Tuzo Wilson dies ... geophysicist and geologist.
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| ||2009: László Tisza dies ... physicist and academic (b. 1907)
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| ||2013: Benjamin Fain dies ... physicist and academic (b. 1930)
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| ||2014: John Houbolt dies ... engineer and academic (b. 1919) lunar
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| File:Cantor Parabola.jpg|link=Cantor Parabola|2017: Math photographer [[Cantor Parabola]] attends Minicon 52, taking a series of photographs with temporal superimpositions from Minicons 51 and 53.
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| ||2018: George Oster dies ... mathematical biologist. No pic Wikipedia. See http://news.berkeley.edu/2018/04/20/george-oster-pioneer-in-applying-mathematics-to-biology-dies-at-77/
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| ||2018: Heinz-Dieter Zeh dies ... a professor (later professor emeritus) of the University of Heidelberg and theoretical physicist. He was one of the developers of the many-minds interpretation of quantum mechanics and the discoverer of decoherence, first described in his seminal 1970 paper. Pic: https://scilogs.spektrum.de/das-zauberwort/der-alte-mann-und-das-multiversum-ein-nachruf-auf-h-dieter-zeh/ | | File:Johannes Bosscha.jpg|link=Johannes Bosscha (nonfiction)|1911: Physicist [[Johannes Bosscha (nonfiction)|Johannes Bosscha Jr.]] dies. Bosscha made important investigations on galvanic polarization and the rapidity of sound waves; he was one of the first (1855) to suggest the possibility of sending two messages simultaneously over the same wire. |
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| </gallery> | | </gallery> |
