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| File:Eclipse.jpg|link=Eclipse of Odysseus (nonfiction)|April 16, 1178 BC: A solar eclipse occurs. Homer's ''Odyssey'' contains a passage which may reference the eclipse: "The Sun has been obliterated from the sky, and an unlucky darkness invades the world." | | File:Eclipse.jpg|link=Eclipse of Odysseus (nonfiction)|1178 BC: A solar eclipse occurs. Homer's ''Odyssey'' contains a passage which may reference the eclipse: "The Sun has been obliterated from the sky, and an unlucky darkness invades the world." |
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| File:Petrus Apianus.jpg|link=Petrus Apianus (nonfiction)|1495: Mathematician and astronomer [[Petrus Apianus (nonfiction)|Petrus Apianus]] born. His works on cosmography, ''Astronomicum Caesareum'' (1540) and ''Cosmographicus liber'' (1524), will be extremely influential in his time. | | File:Petrus Apianus.jpg|link=Petrus Apianus (nonfiction)|1495: Mathematician and astronomer [[Petrus Apianus (nonfiction)|Petrus Apianus]] born. Apianus' works on cosmography, ''Astronomicum Caesareum'' (1540) and ''Cosmographicus liber'' (1524), will be extremely influential in his time. |
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| File:Gottfried Wilhelm Leibniz.jpg|link=Gottfried Wilhelm Leibniz (nonfiction)|1673: [[Gottfried Wilhelm Leibniz (nonfiction)|Leibniz]] wrote to Oldenburg about series: "I conjecture that Mr. Collins himself does not speak of these summations of infinite series because he brings forward the example of the series 1/2, 1/3, 1/4, 1/5, 1/6, ... which if it is continued to infinity cannot be summed because the sum is not finite, like the sum of the triangular numbers, but infinite. But now I am cramped by the space of my paper." | | File:John_Hadley.jpg|link=John Hadley (nonfiction)|1682: Mathematician [[John Hadley (nonfiction)|John Hadley]] born. Hadley will lay claim to the invention of the octant, two years after Thomas Godfrey claims the same. Hadley will also develope ways to make precision aspheric and parabolic objective mirrors for reflecting telescopes. |
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| ||1682 – John Hadley, English mathematician, invented the octant (d. 1744)
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| File:Sir Isaac Newton by Sir Godfrey Kneller.jpg|link=Isaac Newton (nonfiction)|1705: Physicist and mathematician [[Isaac Newton (nonfiction)|Isaac Newton]] knighted by Queen Anne at Trinity College.
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| ||1728 – Joseph Black, French-Scottish physician and chemist (d. 1799)
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| ||1756 – Jacques Cassini, French astronomer (b. 1677)
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| ||1783 – Christian Mayer, Czech astronomer and educator (b. 1719)
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| ||1788 – Georges-Louis Leclerc, Comte de Buffon, French mathematician, cosmologist, and author (b. 1707)
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| ||Victor Alexandre Puiseux (b. 16 April 1820) was a French mathematician and astronomer. Puiseux series are named after him, as is in part the Bertrand–Diquet–Puiseux theorem.
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| ||1823 – Gotthold Eisenstein, German mathematician and academic (d. 1852) Ferdinand Gotthold Max Eisenstein (16 April 1823 – 11 October 1852) was a German mathematician. He specialized in number theory and analysis, and proved several results that eluded even Gauss.
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| ||William Lofland Dudley (b. April 16, 1859) was an American chemistry professor. Pic.
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| ||1867 – Wilbur Wright, American inventor (d. 1912)
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| ||1881 – In Dodge City, Kansas, Bat Masterson fights his last gun battle.
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| ||1888 – Zygmunt Florenty Wróblewski, Polish physicist and chemist (b. 1845)
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| ||Jerzy Neyman (b. April 16, 1894), born Jerzy Spława-Neyman, was a Polish mathematician and statistician
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| ||1895 – Ove Arup, English-Danish engineer and businessman, founded Arup (d. 1988) Sydney Opera House
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| ||Hellmuth Kneser (b. 16 April 1898) was a Baltic German mathematician, who made notable contributions to group theory and topology. His most famous result may be his theorem on the existence of a prime decomposition for 3-manifolds. His proof originated the concept of normal surface, a fundamental cornerstone of the theory of 3-manifolds.
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| ||1899 – Osman Achmatowicz, Polish chemist and academic (d. 1988)
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| ||1907 – Joseph-Armand Bombardier, Canadian inventor and businessman, founded Bombardier Inc. (d. 1964)
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| ||1914 – George William Hill, American astronomer and mathematician (b. 1838)
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| ||1919 – Thomas Willmore, English geometer and academic (d. 2005)
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| ||1929 – Ralph Slatyer, Australian biologist and ecologist (d. 2012)
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| ||1936 – Vadim Kuzmin, Russian physicist and academic (d. 2015). Pic.
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| ||1943 – Albert Hofmann accidentally discovers the hallucinogenic effects of the research drug LSD. He intentionally takes the drug three days later on April 19.
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| ||1947 – Bernard Baruch first applies the term "Cold War" to describe the relationship between the United States and the Soviet Union.
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| File:Rosalind Franklin.jpg|link=Rosalind Franklin (nonfiction)|1958: Chemist and X-ray crystallographer [[Rosalind Franklin (nonfiction)|Rosalind Franklin]] dies. She made contributions to the discovery of the molecular structure of DNA (deoxyribonucleic acid).
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| File:Asclepius Myrmidon in Advanced Test Reactor.jpg|link=Asclepius Myrmidon|1958: Combat physician and alleged time-traveller [[Asclepius Myrmidon]] prevents [[Colonel Zersetzung]] from detonating the [[1958 Tybee Island mid-air collision (nonfiction)|Tybee Bomb]].
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| File:Mk15 nuclear bomb.jpg|link=1958 Tybee Island mid-air collision (nonfiction)|1958: The United States military announces that the search for [[1958 Tybee Island mid-air collision (nonfiction)|hydrogen bomb known as the Tybee Bomb was unsuccessful]]. | | File:Mk15 nuclear bomb.jpg|link=1958 Tybee Island mid-air collision (nonfiction)|1958: The United States military announces that the search for [[1958 Tybee Island mid-air collision (nonfiction)|hydrogen bomb known as the Tybee Bomb was unsuccessful]]. |
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| File:Brainiac Explains Lecture Series (Dominic Yeso).jpg|link=Brainiac Explains|1962: [[Brainiac Explains]] lecture series explains why [[Colonel Zersetzung]] failed to detonate the [[1958 Tybee Island mid-air collision (nonfiction)|Tybee Bomb]].
| | File:Edward Lorenz.jpg|link=Edward Lorenz (nonfiction)|2008: Mathematician [[Edward Lorenz (nonfiction)|Edward Lorenz]] dies. Lorenz introduced the strange attractor notion, and coined the term butterfly effect. |
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| ||1972 – Apollo program: The launch of Apollo 16 from Cape Canaveral, Florida.
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| ||1998 – Alberto Calderón, Argentinian-American mathematician and academic (b. 1920)
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| File:Edward Lorenz.jpg|link=Edward Lorenz (nonfiction)|2008: Mathematician [[Edward Lorenz (nonfiction)|Edward Lorenz]] dies. He introduced the strange attractor notion, and coined the term butterfly effect. | |
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| File:Lorenz_attractor_trajectory-through-phase-space.gif|link=Lorenz system (nonfiction)|2008: [[Lorenz system (nonfiction)|Lorenz system]] diagram says it "owes everything to [[Edward Lorenz (nonfiction)|Papa Lorenz]]."
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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:Red Spiral 3.jpg|link=Red Spiral 3 (nonfiction)|Signed first edition of ''[[Red Spiral 3 (nonfiction)|Red Spiral 3]]'' sells for $150,000 in charity auction to benefit victims of [[crimes against mathematical constants]].
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