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| ||485 – Proclus, Greek mathematician and philosopher (b. 412)
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| File:Giovanni_Battista_Riccioli.jpg|link=Giovanni Battista Riccioli (nonfiction)|1598: Priest and astromomer [[Giovanni Battista Riccioli (nonfiction)|Giovanni Battista Riccioli]] born. He will experiment with pendulums and falling bodies, discuss arguments concerning the motion of the Earth, and introduce the current scheme of lunar nomenclature. | | File:Giovanni_Battista_Riccioli.jpg|link=Giovanni Battista Riccioli (nonfiction)|1598: Priest and astromomer [[Giovanni Battista Riccioli (nonfiction)|Giovanni Battista Riccioli]] born. Riccioli will experiment with pendulums and falling bodies, discuss arguments concerning the motion of the Earth, and introduce the current scheme of lunar nomenclature. |
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| ||1605: Clergyman, mathematician, and astrologer Nathaniel Torporley buried.
| | File:Kerry Wendell Thornley.jpg|link=Kerry Wendell Thornley (nonfiction)|1938: Philosopher and author [[Kerry Wendell Thornley (nonfiction)|Kerry Wendell Thornley]] born. Thornley will write a manuscript, ''The Idle Warriors'', about his acquaintence Lee Harvey Oswald. |
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| File:Johan Carl Wilcke.jpg|link=Johan Wilcke (nonfiction)|1781: Physicist [[Johan Wilcke (nonfiction)|Johan Carl Wilcke]] invents an electrophorus which uses [[Gnomon algorithm]] techniques to calculate the latent heat of ice.
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| ||1790 – Benjamin Franklin, American inventor, publisher, and politician, 6th President of Pennsylvania (b. 1706)
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| ||1798 – Étienne Bobillier, French mathematician and academic (d. 1840)
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| ||Samuel Morey (d. April 17, 1843) was an American inventor, who worked on early internal combustion engines and was a pioneer in steamships who accumulated a total of 20 patents.
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| ||1863 – Augustus Edward Hough Love, English mathematician and theorist (d. 1940)
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| ||Carl Wilhelm Oseen (b. 17 April 1879, Lund) was a theoretical physicist in Uppsala and Director of the Nobel Institute for Theoretical Physics in Stockholm. He formulated the fundamentals of the elasticity theory of liquid crystals (Oseen elasticity theory), as well as the Oseen equations for viscous fluid flow at small Reynolds numbers. He gave his name to the Oseen tensor and, with Horace Lamb, to the Lamb–Oseen vortex. Pic.
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| ||1882 – George Jennings, English engineer and plumber, invented the Flush toilet (b. 1810)
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| ||1895 – Robert Dean Frisbie, American soldier and author (d. 1948)
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| File:John Ambrose Fleming 1890.png|link=John Ambrose Fleming (nonfiction)|1901: Electrical engineer, physicist, and engineer [[John Ambrose Fleming (nonfiction)|John Ambrose Fleming]] publishes new class of [[Gnomon algorithm functions]] which use thermionic valves to detect and prevent [[crimes against physical constants]].
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| ||Eberhard Frederich Ferdinand Hopf (b. April 17, 1902) was a mathematician and astronomer, one of the founding fathers of ergodic theory and a pioneer of bifurcation theory who also made significant contributions to the subjects of partial differential equations and integral equations, fluid dynamics, and differential geometry. Pic.
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| File:Albert Einstein 1921.jpg|link=Albert Einstein (nonfiction)|1915: Physicist, engineer, and alleged time-traveller [[Albert Einstein (nonfiction)|Albert Einstein]] makes radio contact with orbital artificial intelligence [[AESOP]].
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| File:Kerry Wendell Thornley.jpg|link=Kerry Wendell Thornley (nonfiction)|1938: Philosopher and author [[Kerry Wendell Thornley (nonfiction)|Kerry Wendell Thornley]] born. In 1962 he will write a manuscript, ''The Idle Warriors'', about his aquaintence Lee Harvey Oswald. | |
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| ||1942 – Jean Baptiste Perrin, French-American physicist and chemist, Nobel Prize laureate (b. 1870)
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| |File:Wizard Jan Kochanowski.jpg|link=Jan_Kochanowski|1957: [[Jan Kochanowski]] adapts [[Nebra sky disk (nonfiction)|Nebra sky disk]] for use with [[SCORE (satellite) (nonfiction)|Project SCORE satellite]].
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| |File:Atlas-B rocket with SCORE payload.jpg|link=SCORE (satellite) (nonfiction)|1958: [[SCORE (satellite) (nonfiction)|Project SCORE satellite]] incorporates [[Nebra sky disk (nonfiction)|virtual Nebra sky disk]] as backup navigation system.
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| ||1961 – Elda Anderson, American physicist and health researcher (b. 1899)
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| File:Bay of Pigs.jpg|link=Bay of Pigs Invasion (nonfiction)|1961: [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs Invasion]]: A group of Cuban exiles financed and trained by the CIA lands at the Bay of Pigs in Cuba with the aim of ousting Fidel Castro. | | File:Bay of Pigs.jpg|link=Bay of Pigs Invasion (nonfiction)|1961: [[Bay of Pigs Invasion (nonfiction)|Bay of Pigs Invasion]]: A group of Cuban exiles financed and trained by the CIA lands at the Bay of Pigs in Cuba with the aim of ousting Fidel Castro. |
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| File:Baron Zersetzung.jpg|link=Baron Zersetzung|1968: Industrialist, motivational speaker, and alleged crime boss [[Colonel Zersetzung]] takes possession of a large quantity of military-grade [[Clandestiphrine]]. | | File:Sirhan_Sirhan.jpg|link=Assassination of Robert F. Kennedy (nonfiction)|1969: Sirhan Sirhan is convicted of [[Assassination of Robert F. Kennedy (nonfiction)|assassinating Robert F. Kennedy]]. |
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| File:Robert F. Kennedy assassination.jpg|link=Assassination of Robert F. Kennedy (nonfiction)|1969: Sirhan Sirhan is convicted of [[Assassination of Robert F. Kennedy (nonfiction)|assassinating Robert F. Kennedy]].
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| ||1970 – Apollo program: The ill-fated Apollo 13 spacecraft returns to Earth safely.
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| ||Sir Hugh Stott Taylor KBE FRS (d. 17 April 1974) was an English chemist primarily interested in catalysis. In 1925, in a landmark contribution to catalytic theory, Taylor suggested that a catalyzed chemical reaction is not catalysed over the entire solid surface of the catalyst but only at certain 'active sites' or centers. He also developed important methods for procuring heavy water during World War II and pioneered the use of stable isotopes in studying chemical reactions.
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| ||1976 – Henrik Dam, Danish biochemist and physiologist, Nobel Prize laureate (b. 1895)
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| ||Richard Dagobert Brauer (d. April 17, 1977) was a leading German and American mathematician. He worked mainly in abstract algebra, but made important contributions to number theory. He was the founder of modular representation theory.
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| File:Curt Meyer.jpg|link=Curt Meyer (nonfiction)|1978: Mathematician and crime-fighter [[Curt Meyer (nonfiction)|Curt Meyer]] publishes an alternative solution to the class number 1 problem which uses [[Gnomon algorithm functions]] to detect and erase the [[Forbidden Ratio]].
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| File:Piet Hein and H.C. Andersen.jpg|link=Piet Hein (nonfiction)|1996: Mathematician, author, and poet [[Piet Hein (nonfiction)|Piet Hein]] dies. He proposed the use of superellipses in architecture; superellipses subsequently became the hallmark of modern Scandinavian architecture.
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| ||Horace Richard Crane (d. April 19, 2007) was an American physicist, the inventor of the Race Track Synchrotron, a recipient of President Ronald Reagan's National Medal of Science "for the first measurement of the magnetic moment and spin of free electrons and positrons". He was also noted for proving the existence of neutrinos.
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| ||Stephen James Rallis (d. April 17, 2012) was an American mathematician who worked on group representations, automorphic forms, the Siegel–Weil formula, and Langlands L-functions. Pic.
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| ||2014 – NASA's Kepler space observatory confirms the discovery of the first Earth-size planet in the habitable zone of another star.
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| File:Angry_Feller.jpg|link=Angry Feller (nonfiction)|2018: Steganographic analysis of ''[[Angry Feller (nonfiction)|Angry Feller]]'' unexpectedly reveals "at least a megabyte of plaintext data, mostly unsent letters to the editor in the 'You kids get off my lawn' category." | | File:Piet Hein and H.C. Andersen.jpg|link=Piet Hein (nonfiction)|1996: Mathematician, author, and poet [[Piet Hein (nonfiction)|Piet Hein]] dies. Hein proposed the use of superellipses in architecture; superellipses subsequently became the hallmark of modern Scandinavian architecture. |
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| </gallery> | | </gallery> |
