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| |File:Achilles Ajax dice.jpg|link=Dice (nonfiction)|501 BC: Achilles and Ajax play [[Dice (nonfiction)|dice]] to determine who will attend the [[Lucky Spasm Dice Academy]].
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| ||1624 – Henrik Rysensteen, Dutch military engineer (d. 1679)
| | File:Thomas Seebeck.jpg|link=Thomas Johann Seebeck (nonfiction)|1770: Physicist and academic [[Thomas Johann Seebeck (nonfiction)|Thomas Johann Seebeck]] born. Seebeck will discover the thermoelectric effect. |
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| ||Benedetto Castelli (1578 – 9 April 1643), born Antonio Castelli, was an Italian mathematician. pic
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| File:Thomas Seebeck.jpg|link=Thomas Johann Seebeck (nonfiction)|1770: Physicist and academic [[Thomas Johann Seebeck (nonfiction)|Thomas Johann Seebeck]] born. He will discover the thermoelectric effect. | |
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| ||George Peacock (b. 9 April 1791) was an English mathematician.
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| File:Joseph-Louis Lagrange.jpg|link=Joseph-Louis Lagrange (nonfiction)|1805: Mathematician and crime-fighter [[Joseph-Louis Lagrange (nonfiction)|Joseph-Louis Lagrange]] delivers lecture on applications of number theory to the detection and prevention of [[crimes against mathematical constants]].
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| ||Isambard Kingdom Brunel FRS (b. 9 April 1806), was an English mechanical and civil engineer who is considered "one of the most ingenious and prolific figures in engineering history"
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| ||Edmond Nicolas Laguerre (b. April 9, 1834) was a French mathematician, a member of the Académie française (1885). His main works were in the areas of geometry and complex analysis. He also investigated orthogonal polynomials (see Laguerre polynomials). Laguerre's method is a root-finding algorithm tailored to polynomials.
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| File:Edouard-Léon Scott de Martinville.jpg|link=Édouard-Léon Scott de Martinville (nonfiction)|1860: On his phonautograph machine, [[Édouard-Léon Scott de Martinville (nonfiction)|Édouard-Léon Scott de Martinville]] makes the oldest known recording of an audible human voice. A visual recording of audio data, it will first be played back in 2008. | | File:Edouard-Léon Scott de Martinville.jpg|link=Édouard-Léon Scott de Martinville (nonfiction)|1860: On his phonautograph machine, [[Édouard-Léon Scott de Martinville (nonfiction)|Édouard-Léon Scott de Martinville]] makes the oldest known recording of an audible human voice. A visual recording of audio data, it will first be played back in 2008. |
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| File:Wilhelm Röntgen.jpg|link=Wilhelm Röntgen (nonfiction)|1864: Engineer and physicist [[Wilhelm Röntgen (nonfiction)|Wilhelm Röntgen]] uses X-rays generator to expose [[Loaded dice (nonfiction)|loaded dice]], reveals organized [[math crime]] cartel in casinos around the world.
| | File:Charles Proteus Steinmetz.jpg|link=Charles Proteus Steinmetz (nonfiction)|1865: Mathematician and electrical engineer [[Charles Proteus Steinmetz (nonfiction)|Charles Proteus Steinmetz]] born. Steinmetz will foster the development of alternating current, formulating mathematical theories which will advance the expansion of the electric power industry in the United States. |
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| File:Charles Proteus Steinmetz.jpg|link=Charles Proteus Steinmetz (nonfiction)|1865: Mathematician and electrical engineer [[Charles Proteus Steinmetz (nonfiction)|Charles Proteus Steinmetz]] born. He will foster the development of alternating current, formulating mathematical theories which will advance the expansion of the electric power industry in the United States. | |
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| ||André-Michel Guerry (d. April 9, 1866) was a French lawyer and amateur statistician. Together with Adolphe Quetelet he may be regarded as the founder of moral statistics which led to the development of criminology, sociology and ultimately, modern social science.
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| ||Élie Joseph Cartan, ForMemRS (b. 9 April 1869) was an influential French mathematician who did fundamental work in the theory of Lie groups and their geometric applications. He also made significant contributions to mathematical physics, differential geometry, differential equations, group theory and quantum mechanics.
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| ||1883 – Frank King, American cartoonist (d. 1969)
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| ||1889 – Michel Eugène Chevreul, French chemist and academic (b. 1786)
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| ||Cypra Cecilia Krieger-Dunaij (b. 9 April 1894) was mathematician ... well known for having translated two works of Wacław Sierpiński in general topology. Pic.
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| File:Georg Cantor 1894.png|link=Georg Cantor (nonfiction)|1917: Mathematician and philosopher [[Georg Cantor (nonfiction)|Georg Cantor]] publishes new [[Set theory (nonfiction)|theory of sets]] derived from [[Gnomon algorithm functions]]. Colleagues hail it as "a magisterial contribution to science and art of detecting and preventing [[crimes against mathematical constants]]."
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| ||1918 – Jørn Utzon, Danish architect, designed the Sydney Opera House (d. 2008)
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| ||1919 – J. Presper Eckert, American engineer, invented the ENIAC (d. 1995)
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| ||1921 – Mary Jackson, African American mathematician and aerospace engineer (d. 2005)
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| |File:Chautauqua Association Incorporated (1922).jpg|link=Chautauqua (nonfiction)|1922: New generation of [[Chautauqua (nonfiction)|Chautauqua]] artists educate public on the dangers of [[crimes against mathematical constants]].
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| ||1930 – F. Albert Cotton, American chemist and academic (d. 2007)
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| ||1940 – Vidkun Quisling seizes power in Norway.
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| ||1945 – Execution of Dietrich Bonhoeffer, anti-Nazi dissident and spy, by the Nazi regime.
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| ||1945 – The United States Atomic Energy Commission is formed.
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| ||1948 – Jorge Eliécer Gaitán's assassination provokes a violent riot in Bogotá (the Bogotazo), and a further ten years of violence in Colombia.
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| ||1951 – Vilhelm Bjerknes, Norwegian physicist and meteorologist (b. 1862)
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| ||Hans Reichenbach (April 9, 1953) was a leading philosopher of science, educator, and proponent of logical empiricism. He was influential in the areas of science, education, and of logical empiricism: he made lasting contributions to the study of empiricism based on a theory of probability; the logic and the philosophy of mathematics; space, time, and relativity theory; analysis of probabilistic reasoning; and quantum mechanics.
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| ||1959 – Frank Lloyd Wright, American architect, designed the Price Tower and Fallingwater (b. 1867)
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| ||1959 – Project Mercury: NASA announces the selection of the United States' first seven astronauts, whom the news media quickly dub the "Mercury Seven".
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| ||1965 – Astrodome opens. First indoor baseball game is played.
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| File:Skip Digits.jpg|link=Skip Digits|1978: Musician and alleged math criminal [[Skip Digits]] performs at the Kennedy Center for the Arts. | | File:Skip Digits.jpg|link=Skip Digits|1978: Musician and alleged math criminal [[Skip Digits]] performs at the Kennedy Center for the Arts. |
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| ||1981 – The U.S. Navy nuclear submarine USS George Washington accidentally collides with the Nissho Maru, a Japanese cargo ship, sinking it.
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| ||Maximilian Jacob Herzberger (d. 9 Apr 1982, New Orleans, United States) was a German mathematician and physicist, known for his development of the superachromat lens.
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| ||Yozo Matsushima (d. April 9, 1983) was a Japanese mathematician.
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| ||2002 – Leopold Vietoris, Austrian soldier, mathematician, and academic (b. 1891)
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| ||2003 – Jerry Bittle, American cartoonist (b. 1949)
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| ||2007 – Dorrit Hoffleit, American astronomer and academic (b. 1907)
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| ||2015 – Alexander Dalgarno, English physicist and academic (b. 1928)
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| ||2016 – Duane Clarridge, American spy (b. 1932)
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| </gallery> | | </gallery> |
