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| File:Statue of Ibn Rushd in Cordoba.jpg|link=Ibn Rushd (nonfiction)|1126: Polymath [[Ibn Rushd (nonfiction)|Ibn Rushd]] (Averoess) born. He will write on logic, Aristotelian and Islamic philosophy, theology, Islamic jurisprudence, psychology, politics, music theory, geography, mathematics, and the mediæval sciences of medicine, astronomy, physics, and celestial mechanics. | | File:Statue of Ibn Rushd in Cordoba.jpg|link=Ibn Rushd (nonfiction)|1126: Polymath [[Ibn Rushd (nonfiction)|Ibn Rushd]] (Averoess) born. He will write on logic, Aristotelian and Islamic philosophy, theology, Islamic jurisprudence, psychology, politics, music theory, geography, mathematics, and the mediæval sciences of medicine, astronomy, physics, and celestial mechanics. |
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| File:Leonardo_da_Vinci_in_flight.jpg|link=Leonardo da Vinci|1477: Polymath [[Leonardo da Vinci]] accepts commission to build a mechanical soldier powered by [[Time crystal (nonfiction)|time crystals]]. | | File:Abraham Ortelius by Peter Paul Rubens.jpg|link=Abraham Ortelius (nonfiction)|1527: Cartographer and geographer [[Abraham Ortelius (nonfiction)|Abraham Ortelius]] born. Ortelius will create the first modern atlas, the ''Theatrum Orbis Terrarum''. He will also be one of the first to imagine that the continents were joined together before drifting to their present positions. |
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| ||1527 – Abraham Ortelius, Flemish cartographer and geographer (d. 1598)
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| ||1561 – A Celestial phenomenon is reported over Nuremberg, described as an aerial battle.
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| ||1572 – Adam Tanner, Austrian mathematician, philosopher, and academic (d. 1632)
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| File:Christiaan Huygens.jpg|link=Christiaan Huygens (nonfiction)|1629: Mathematician, astronomer, and physicist [[Christiaan Huygens (nonfiction)|Christiaan Huygens]] born. He will be a leading scientist of his time. | | File:Christiaan Huygens.jpg|link=Christiaan Huygens (nonfiction)|1629: Mathematician, astronomer, and physicist [[Christiaan Huygens (nonfiction)|Christiaan Huygens]] born. He will be a leading scientist of his time. |
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| |link=Nathaniel Torporley (nonfiction)|1632: Date of clergyman, mathematician, and astrologer [[Nathaniel Torporley (nonfiction)|Nathaniel Torporley]]'s nuncipative will, by which he bequeathed to the library of Sion College all his mathematical books, astronomical instruments, notes, maps, and a brass clock.
| | File:Sistine Chapel.jpg|link=Flooding the Sistine Chapel|1659: Proposals to [[Flooding the Sistine Chapel|flood the Sistine chapel]] "are equally useless to Science and Art alike," writes [[Christiaan Huygens (nonfiction)|Christiaan Huygens]] in a private letter to Pope Alexander VII. |
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| File:Sistine Chapel.jpg|link=Flooding the Sistine Chapel|1659: Proposals to [[Flooding the Sistine Chapel|flood the Sistine chapel]] "are equally useless to Science and Art," writes [[Christiaan Huygens (nonfiction)|Christiaan Huygens]] in a private letter to Pope Alexander VII. | |
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| ||1678 – Abraham Darby I, English iron master (d. 1717)
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| ||Maximilian Hell (Hungarian: Hell Miksa) (d. April 14, 1792) was a Hungarian astronomer and an ordained Jesuit priest from the Kingdom of Hungary.
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| ||1800 – John Appold, English engineer (d. 1865)
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| ||1828 – Noah Webster copyrights the first edition of his dictionary.
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| ||1882 – Moritz Schlick, German-Austrian physicist and philosopher (d. 1936)
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| ||1882: Baptiste Jules Henri Jacques Giffard dies ... engineer. In 1852 he invented the steam injector and the powered Giffard dirigible airship. Pic.
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| ||Ralph Elmer Wilson (b. April 14, 1886) was an American astronomer.
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| ||Wilhelm Fenner (14 April 1891) was a German cryptanalyst, before and during the time of World War II in the OKW/Chi, the Cipher Department of the High Command of the Wehrmacht, working within the main cryptanalysis group, and entrusted with deciphering enemy message traffic (Cryptography). Pic.
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| File:Kinetoscope.jpg|link=Kinetoscope (nonfiction)|1894: The first ever commercial motion picture house opened in New York City using ten [[Kinetoscope (nonfiction)|Kinetoscopes]], a device for peep-show viewing of films.
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| ||James Dwight Dana FRS FRSE (d. April 14, 1895) was an American geologist, mineralogist, volcanologist, and zoologist. He made pioneering studies of mountain-building, volcanic activity, and the origin and structure of continents and oceans around the world. Pic.
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| File:Fightin' Bert Russell.jpg|link=Bertrand Russell|1898: [[Bertrand Russell|"Fightin'" Bert Russell]] agrees to fight three rounds of bare-knuckled boxing at World Peace Conference.
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| File:Gabriel Sudan 1932.jpg|link=Gabriel Sudan (nonfiction)|1899: Mathematician [[Gabriel Sudan (nonfiction)|Gabriel Sudan]] born. He will discover the Sudan function, an important example in the theory of computation, similar to the Ackermann function.
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| ||1900 – The Exposition Universelle begins.
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| ||Otto Wilhelm von Struve (d. April 14, 1905) was a Russian astronomer. Together with his father, Friedrich Georg Wilhelm von Struve, Otto Wilhelm von Struve is considered a prominent 19th century astronomer who headed the Pulkovo Observatory between 1862 and 1889 and was a leading member of the Russian Academy of Sciences. Pic.
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| ||1908 – Hauser Dam, a steel dam on the Missouri River in Montana, U.S., fails, sending a surge of water 25 to 30 feet (7.6 to 9.1 m) high downstream.
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| ||1909 – A massacre is organized by the Ottoman Empire against the Armenian population of Cilicia.
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| ||1912 – The British passenger liner RMS Titanic hits an iceberg in the North Atlantic at 23:40 (sinks morning of April 15th).
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| ||1927 – Alan MacDiarmid, New Zealand chemist and academic, Nobel Prize laureate (d. 2007)
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| ||1927: Mathematician Marcel Berger born. He will work in differential geometry. Pic.
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| ||1928 – The Bremen, a German Junkers W 33 type aircraft, reaches Greenly Island, Canada - the first successful transatlantic aeroplane flight from east to west.
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| File:John_Brunner's_Lee_and_Turner_engine.jpg|link=John Brunner|1934: Author and alleged time-traveller [[John Brunner]] uses [[Scrying engine|Lee and Turner scrying engine]] to detect and expose [[crimes against mathematical constants]].
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| File:Emmy Noether.jpg|link=Emmy Noether (nonfiction)|1935: Mathematician [[Emmy Noether (nonfiction)|Emmy Noether]] dies. She made landmark contributions to abstract algebra and theoretical physics. | | File:Emmy Noether.jpg|link=Emmy Noether (nonfiction)|1935: Mathematician [[Emmy Noether (nonfiction)|Emmy Noether]] dies. She made landmark contributions to abstract algebra and theoretical physics. |
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| ||1935 – The Black Sunday dust storm, considered one of the worst storms of the Dust Bowl, swept across the Oklahoma and Texas panhandles and neighboring areas.
| | File:Tatyana_Afanasyeva.jpg|link=Tatyana Afanasyeva (nonfiction)|1964: Mathematician and theorist [[Tatyana Afanasyeva (nonfiction)|Tatyana Afanasyeva]] dies. She contributed to statistical mechanics and statistical thermodynamics, and to mathematical education in the Netherlands. |
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| ||1939 – The Grapes of Wrath, by American author John Steinbeck is first published by the Viking Press.
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| ||Ronald Wilfred (or Wilfrid) Gurney (d. 14 April 1953, New York, New York) was a British theoretical physicist
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| ||1958: dies: Karl Lark-Horovitz was an American physicist known for his pioneering work in solid-state physics that played a role in the invention of the transistor. He brought the previously neglected Physics Department at Purdue University to prominence during his tenure there as department head from 1929 until his death in 1958. Pic.
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| ||1958: The Soviet satellite Sputnik 2 falls from orbit after a mission duration of 162 days. This was the first spacecraft to carry a living animal, a female dog named Laika, who likely lived only a few hours.
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| ||1964: Tatyana Afanasyeva dies ... mathematician and theorist.
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| ||1964: Rachel Carson dies ... biologist and author.
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| ||1981 – STS-1: The first operational Space Shuttle, Columbia completes its first test flight.
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| ||2000: Phil Katz dies ... computer programmer, co-created the zip file format.
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| ||2003: The Human Genome Project is completed with 99% of the human genome sequenced to an accuracy of 99.99%.
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| ||2004: Robin John Popplestone dies ... pioneer in the fields of machine intelligence and robotics. He is known for developing the COWSEL and POP programming languages, and for his work on Freddy II. Pic.
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| ||2005: Saunders Mac Lane dies ... mathematician who co-founded category theory with Samuel Eilenberg.
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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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| File:Golden Spiral.jpg|link=Golden Spiral (nonfiction)|2018: ''[[Golden Spiral (nonfiction)|Golden Spiral]]'' is declared Picture of the Day by the citizens of [[New Minneapolis, Canada]].
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