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| ||921: Abe no Seimei born ... Japanese astrologer.
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| ||1556: Sethus Calvisius born ... astronomer, composer, and theorist,
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| File:Gérard Desargues.jpg|link=Girard Desargues (nonfiction)|1591: Mathematician and engineer [[Girard Desargues (nonfiction)|Girard Desargues]] born. He will be one of the founders of projective geometry. | | File:Gérard Desargues.jpg|link=Girard Desargues (nonfiction)|1591: Mathematician and engineer [[Girard Desargues (nonfiction)|Girard Desargues]] born. He will be one of the founders of projective geometry. |
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| File:Canterbury_scrying_engine.jpg|link=Canterbury scrying engine|1592: [[Canterbury scrying engine]] crashes, predicts faulty future; the resulting paradox will develop into an [[Capacitor plague (nonfiction)|epidemic of capacitor failure]] by the early twenty-first century. | | File:Canterbury_scrying_engine.jpg|link=Canterbury scrying engine|1592: [[Canterbury scrying engine]] crashes, predicts faulty future; the resulting paradox will develop into an [[Capacitor plague (nonfiction)|epidemic of capacitor failure]] by the early twenty-first century. |
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| ||1632: Galileo's epic ''Dialogue on the Two Chief World Systems'' is Published in Florence. After receiving, what Galileo viewed as permission to write about "the systems of the world" from the new pope, Urban VIII. Greeted with Praise from scholars across Europe, it would eventually be Galileo's downfall. *Brody & Brody, The Science Class You Wish You Had https://pballew.blogspot.com/2019/02/on-this-day-in-math-february-21.html Pic.
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| File:Baruch Spinoza.jpg|link=Baruch Spinoza (nonfiction)|1677: Philosopher, scholar, and lens-grinder [[Baruch Spinoza (nonfiction)|Baruch Spinoza]] dies. He laid the groundwork for the 18th-century Enlightenment and modern biblical criticism, including modern conceptions of the self and the universe. | | File:Baruch Spinoza.jpg|link=Baruch Spinoza (nonfiction)|1677: Philosopher, scholar, and lens-grinder [[Baruch Spinoza (nonfiction)|Baruch Spinoza]] dies. He laid the groundwork for the 18th-century Enlightenment and modern biblical criticism, including modern conceptions of the self and the universe. |
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| ||1764: Ruan Yuan born ... the most prominent Chinese scholar during the first half of the 19th century.[1] He won the jinshi degree in the imperial examinations in 1789 and was subsequently appointed to the Hanlin Academy. He was known for his work ''Biographies of Astronomers and Mathematicians''. Pic.
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| File:Sir Francis Ronalds.jpg|link=Francis Ronalds (nonfiction)|1788: Scientist, inventor, and engineer [[Francis Ronalds (nonfiction)|Francis Ronalds]] born. He will be knighted for creating the first working electric telegraph. | | File:Sir Francis Ronalds.jpg|link=Francis Ronalds (nonfiction)|1788: Scientist, inventor, and engineer [[Francis Ronalds (nonfiction)|Francis Ronalds]] born. He will be knighted for creating the first working electric telegraph. |
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| ||1804: The first self-propelling steam locomotive makes its outing at the Pen-y-Darren Ironworks in Wales.
| | File:Charles Piazzi Smyth.jpg|link=Charles Piazzi Smyth (nonfiction)|1900: Astronomer [[Charles Piazzi Smyth (nonfiction)|Charles Piazzi Smyth]] dies. Smyth made innovations in astronomy, and made pyramidological and metrological studies of the Great Pyramid of Giza. |
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| ||1811: As Humphry Davy read a paper to the Royal Society, he introduced the name "chlorine" from the Greek word for "green," for the bright yellow green gas chemists then knew as oxymuriatic gas. Pic.
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| ||1828: Initial issue of the Cherokee Phoenix is the first periodical to use the Cherokee syllabary invented by Sequoyah.
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| ||1839: Pietro Paoli dies ... mathematician. Pic: book cover.
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| ||1842: John Greenough is granted the first U.S. patent for the sewing machine.
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| ||1862: Justinus Andreas Christian Kerner dies ... poet, practicing physician, and medical writer.
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| ||1878: The first telephone directory is issued in New Haven, Connecticut.
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| ||1894: Shanti Swaroop Bhatnagar born ... chemist and academic. Pic: postage stamp.
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| ||1895: Henrik Dam born ... biochemist and physiologist, Nobel Prize laureate.
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| File:Curie_and_radium_by_Castaigne.jpg|link=Radium (nonfiction)|1899: Marie and Pierre Curie use [[Radium (nonfiction)|radium]] to detect and expose [[crimes against physical constants]]. | |
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| ||1900: Charles Piazzi Smyth dies ... astronomer who was Astronomer Royal for Scotland from 1846 to 1888; he is known for many innovations in astronomy and his pyramidological and metrological studies of the Great Pyramid of Giza. Pic.
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| ||1912: György Hajós born ... mathematician who worked in group theory, graph theory, and geometry.
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| ||1912: Osborne Reynolds dies ... innovator in the understanding of fluid dynamics. Separately, his studies of heat transfer between solids and fluids brought improvements in boiler and condenser design. Pic.
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| ||1921: Richard T. Whitcomb born ... aeronautical engineer.
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| ||1924: Thelma Estrin born ... computer scientist and engineer.
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| ||1923: George de Bothezat helicopter flight. Pic: https://commons.wikimedia.org/wiki/File:De_Bothezat_Quadrotor.jpg
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| ||1924: Dorothy Blum born ... computer scientist and cryptanalyst.
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| File:Heike Kamerlingh Onnes.jpg|link=Heike Kamerlingh Onnes (nonfiction)|1926: Physicist and academic [[Heike Kamerlingh Onnes (nonfiction)|Heike Kamerlingh Onnes]] dies. He received widespread recognition for his work, including the 1913 Nobel Prize in Physics for "his investigations on the properties of matter at low temperatures which led, ''inter alia'', to the production of liquid helium". | | File:Heike Kamerlingh Onnes.jpg|link=Heike Kamerlingh Onnes (nonfiction)|1926: Physicist and academic [[Heike Kamerlingh Onnes (nonfiction)|Heike Kamerlingh Onnes]] dies. He received widespread recognition for his work, including the 1913 Nobel Prize in Physics for "his investigations on the properties of matter at low temperatures which led, ''inter alia'', to the production of liquid helium". |
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| File:Alice Beta.jpg|link=Alice Beta|1933: [[Alice Beta]] tells reporters that the rise of the Nazi party in Germany will lead to "new and unprecedently dangerous [[crimes against mathematical constants]]."
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| File:George Ellery Hale.jpg|link=George Ellery Hale (nonfiction)|1938: Astronomer and journalist [[George Ellery Hale (nonfiction)|George Ellery Hale]] dies. He discovered magnetic fields in sunspots, and was a leader or key figure in the planning or construction of several world-leading telescopes.
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| ||1941: Frederick Banting dies ... physician and academic, Nobel Prize laureate.
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| ||1947: In New York City, Edwin Land demonstrates the first "instant camera", the Polaroid Land Camera, to a meeting of the Optical Society of America.
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| ||1958: The Peace symbol is designed and completed by Gerald Holtom.
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| ||1962: Julio Rey Pastor dies ... mathematician and historian of science.
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| ||1965: Malcolm X is assassinated at the Audubon Ballroom in New York City.
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| ||1968: Howard Florey dies ... pathologist and pharmacologist, Nobel Prize laureate.
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| ||1972: The Soviet unmanned spaceship Luna 20 lands on the Moon.
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| File:Egon Rhodomunde.jpg|link=Egon Rhodomunde|1974: Film director and arms dealer [[Egon Rhodomunde]] privately advises White House aides H. R. Haldeman and John Ehrlichman that they "will both be sentenced to jail a year from today" for their roles in the [[Watergate scandal (nonfiction)|Watergate scandal]].
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| File:Nixon April-29-1974.jpg|link=Watergate scandal (nonfiction)|1975: [[Watergate scandal (nonfiction)|Watergate scandal]]: Former United States Attorney General John N. Mitchell and former White House aides H. R. Haldeman and John Ehrlichman are sentenced to prison.
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| ||1980: Aldo Andreotti dies ... mathematician who worked on algebraic geometry, on the theory of functions of several complex variables and on partial differential operators. Notably he proved the Andreotti–Frankel theorem, the Andreotti–Grauert theorem, the Andreotti–Vesentini theorem and introduced, jointly with François Norguet, the Andreotti–Norguet integral representation for functions of several complex variables. Pic.
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| ||1990: Isaac Jacob Schoenberg dies ... mathematician, known for his discovery of splines. Pic.
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| ||1999: Gertrude B. Elion dies ... biochemist and pharmacologist, Nobel Prize laureate. Pic search: https://www.google.com/search?q=gertrude+b.+elion
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| ||2000: Major General Kenneth David "Nick" Nichols dies ... United States Army officer and an engineer. He worked on the Manhattan Project, which developed the Atomic Bomb during World War II, as Deputy District Engineer to James C. Marshall, and from 13 August 1943 as the District Engineer of the Manhattan Engineer District. He was responsible for both the uranium production facility at the Clinton Engineer Works at Oak Ridge, Tennessee and the plutonium production facility at Hanford Engineer Works in Washington state.
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| File:Exploded electrolytic capacitor.jpg|link=Capacitor plague (nonfiction)|2002: [[Capacitor plague (nonfiction)|Capacitor plague]] affects several brands of [[portable envy]] devices.
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| ||2009: Ilya Piatetski-Shapiro dies ... mathematician. During a career that spanned 60 years he made major contributions to applied science as well as pure mathematics. In the last forty years his research focused on pure mathematics; in particular, analytic number theory, group representations and algebraic geometry. His main contribution and impact was in the area of automorphic forms and L-functions. Pic.
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| File:Yellow Spiral.jpg|link=Yellow Spiral (nonfiction)|2016: Signed first edition of ''[[Yellow Spiral (nonfiction)|Yellow Spiral]]'' stolen from the Uffizi gallery in Florence by agents of the [[Forbidden Ratio]] gang, perhaps under contract to [[Baron Zersetzung]].
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| ||2018: Andrew Alexander Ranicki dies ... mathematician who worked on algebraic topology. More: https://www.maths.ed.ac.uk/~v1ranick/surgery/bio.htm Pic.
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| </gallery> | | </gallery> |
