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| File:Thomas Fincke.jpg|link=Thomas Fincke (nonfiction)|1579: Mathematician and physicist [[Thomas Fincke (nonfiction)|Thomas Fincke]] invents new type of [[scrying engine]] which pre-visualizes tangents and secants. He will use the engine to detect and expose [[crimes against mathematical constants]].
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| File:Johannes Kepler 1610.jpg|link=Johannes Kepler (nonfiction)|1618: [[Johannes Kepler (nonfiction)|Johannes Kepler]] confirms his previously rejected discovery of the third law of planetary motion (he first discovered it on March 8 but soon rejected the idea after some initial calculations were made). | | File:Johannes Kepler 1610.jpg|link=Johannes Kepler (nonfiction)|1618: [[Johannes Kepler (nonfiction)|Johannes Kepler]] confirms his previously rejected discovery of the third law of planetary motion (he first discovered it on March 8 but soon rejected the idea after some initial calculations were made). |
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| ||1718: James Puckle, a London lawyer, patents the world's first machine gun.
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| ||1720: Maximilian Hell born ... priest and astronomer.
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| ||1773: Alban Butler dies ... priest and hagiographer.
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| ||1793: Diego Marín Aguilera flies a glider for "about 360 meters", at a height of 5–6 meters, during one of the first attempted manned flights.
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| File:Joseph Ludwig Raabe.jpg|link=Joseph Ludwig Raabe (nonfiction)|1801: Mathematician [[Joseph Ludwig Raabe (nonfiction)|Joseph Ludwig Raabe]] born. He will discover Raabe's ratio test, which determines the convergence or divergence of an infinite series, in some cases. | | File:Joseph Ludwig Raabe.jpg|link=Joseph Ludwig Raabe (nonfiction)|1801: Mathematician [[Joseph Ludwig Raabe (nonfiction)|Joseph Ludwig Raabe]] born. He will discover Raabe's ratio test, which determines the convergence or divergence of an infinite series, in some cases. |
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| File:Francis Baily.jpg|link=Francis Baily (nonfiction)|1836: Astronomer [[Francis Baily (nonfiction)|Francis Baily]] observes "Baily's beads" during an annular eclipse. | | File:Francis Baily.jpg|link=Francis Baily (nonfiction)|1836: Astronomer [[Francis Baily (nonfiction)|Francis Baily]] observes "Baily's beads" during an annular eclipse. |
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| ||1857: Williamina Fleming born ... astronomer and academic.
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| ||1858: Robert Hare ... chemist. Pic.
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| ||1859: Pierre Curie born ... physicist and academic, Nobel Prize laureate.
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| ||1862: Cassius Jackson Keyser dies ... mathematician.
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| File:Asclepius Myrmidon Prepares for Emergency Field Surgery.jpg|link=Asclepius Myrmidon Prepares for Emergency Field Surgery|1864: ''Asclepius Myrmidon Prepares for Emergency Field Surgery'' incorporated into army medical manuals on both sides of the American Civil War.
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| File:Euclid's algorithm.svg|link=Algorithm (nonfiction)|1888: Council of [[Algorithm (nonfiction)|algorithms]] announces plans to fund and build a Museum of Algorithms.
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| ||1891: Fritz Feigl born ... chemist and academic.
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| ||1900: Ida Rhodes born ... mathematician, pioneer in computer programming.
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| ||1902: Sigizmund Levanevsky born ... aircraft pilot of Polish origin.
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| ||1903: Maria Reiche born ... mathematician and archaeologist.
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| ||1904: Russo-Japanese War: The Russian minelayer Amur lays a minefield about 15 miles off Port Arthur and sinks Japan's battleships Hatsuse, 15,000 tons, with 496 crew and Yashima.
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| ||1906: James Blyth dies ... electrical engineer and academic at Anderson's College, now the University of Strathclyde, in Glasgow. He was a pioneer in the field of electricity generation through wind power and his wind turbine, which was used to light his holiday home in Marykirk, was the world's first-known structure by which electricity was generated from wind power. Pic: http://scienceonstreets.phys.strath.ac.uk/new/James_Blyth.html
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| ||1911: In Standard Oil Co. of New Jersey v. United States, the United States Supreme Court declares Standard Oil to be an "unreasonable" monopoly under the Sherman Antitrust Act and orders the company to be broken up.
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| ||1919: The Winnipeg general strike begins. By 11:00, almost the whole working population of Winnipeg had walked off the job
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| ||1923: Arthur Gordon Webster dies ... physicist, was a founder and president of the American Physical Society. Pic.
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| ||1928: Walt Disney character Mickey Mouse premieres in his first cartoon, "Plane Crazy".
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| ||1932: In an attempted coup d'état, the Prime Minister of Japan Inukai Tsuyoshi is assassinated.
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| ||1933: All military aviation organizations within, or under the control of, the RLM of Germany were officially merged in a covert manner, to form its Wehrmacht military's air arm, the Luftwaffe.
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| ||1934: Kārlis Ulmanis establishes an authoritarian government in Latvia.
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| ||1939: Mathematician Brian Hartley born. He will specialize in group theory. Pic: http://www.maths.manchester.ac.uk/about-us/history/brian-hartley/
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| ||1944: Chicago Pile-3 (CP-3) was the first heavy water reactor in the world, going critical on 15 May 1944. It was used in the experimental physics work of the Metallurgical Laboratory for the Manhattan Project. Pic.
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| ||1956: Austin Osman Spare dies ... painter and magician.
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| ||1957: At Malden Island in the Pacific Ocean, Britain tests its first hydrogen bomb in Operation Grapple.
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| ||1958: The Soviet Union launches Sputnik 3.
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| ||1959: Alexander Forbes Irvine Forbes dies ... astronomer.
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| ||1960: The Soviet Union launches Sputnik 4.
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| ||1963: Project Mercury: The launch of the final Mercury mission, Mercury-Atlas 9 with astronaut Gordon Cooper on board. He becomes the first American to spend more than a day in space, and the last American to go into space alone.
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| ||1972: In Laurel, Maryland, Arthur Bremer shoots and paralyzes Alabama Governor George Wallace while he is campaigning to become President.
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| ||1973: Captain, U.S.N. Laurance Frye Safford (d. May 15, 1973) was a U.S. Navy cryptologist. He established the Naval cryptologic organization after World War I, and headed the effort more or less constantly until shortly after the Japanese attack on Pearl Harbor. His identification with the Naval effort was so close that he was the Friedman of the Navy.
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| ||1986: Helene (Hel) Braun dies ... mathematician who specialized in number theory and modular forms; proving the convergence of the Eisenstein series. She also wrote an autobiography, ''The Beginning of A Scientific Career'', describing her experience as a female scientist in the Third Reich. No pic.
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| ||1991: Andreas Floer dies ... mathematician and academic.
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| ||1993: Camillo Herbert Grötzsch dies ... mathematician. He was born in Döbeln and died in Halle. Grötzsch worked in graph theory. He was the discoverer and eponym of the Grötzsch graph, a triangle-free graph that requires four colors in any graph coloring, and Grötzsch's theorem, the result that every triangle-free planar graph requires at most three colors.
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| File:Greedy colorings.svg|link=Greedy coloring (nonfiction)|2018: News study suggests that [[Greedy coloring (nonfiction)|Greedy coloring]] algorithms "have been systematically corrupted by a consortium of [[math criminals]] including [[Anarchimedes]], [[Forbidden Ratio]], and parties as yet uncounted and unidentified."
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