Template:Selected anniversaries/April 21: Difference between revisions

Revision as of 07:57, 2 April 2017

1718: Painter, mathematician, astronomer, and architect Philippe de La Hire dies.
1774: Physicist, astronomer, and mathematician Jean-Baptiste Biot born. He will establish the reality of meteorites, make an early balloon flight, and study the polarization of light.
1793: American captain and mathematician Nathaniel Bowditch publishes new class of Gnomon algorithm functions which improved maritime navigation techniques.
1910: Writer, entrepreneur, publisher and lecturer Mark Twain dies.
1910: Mathematician Richard Courant invents new type of scrying engine to detect and prevent crimes against mathematical constants.

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 File:Mark Twain by Abdullah Frères, 1867.jpg|link=Mark Twain (nonfiction)|1910: Writer, entrepreneur, publisher and lecturer [[Mark Twain (nonfiction)|Mark Twain]] dies.
 File:Richard Courant.jpg|link=Richard Courant (nonfiction)|1910: Mathematician [[Richard Courant (nonfiction)|Richard Courant]] invents new type of [[scrying engine]] to detect and prevent [[crimes against mathematical constants]].
-File:Jean Bartik.jpg|link=Jean Bartik (nonfiction)|1963: [[Jean Bartik (nonfiction)|Jean Bartik]] uses [[Gnomon algorithm]] to fight [[crimes against mathematical constants]].
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-https://en.wikipedia.org/wiki/Shakuntala_Devi
-https://en.wikipedia.org/wiki/Simon_de_la_Loub%C3%A8re
-https://en.wikipedia.org/wiki/Jean-Baptiste_Biot
-https://en.wikipedia.org/wiki/Petrus_Apianus
-– A Transit-5bn satellite fails to reach orbit after launch; as it re-enters the atmosphere, 2.1 pounds (0.95 kg) of radioactive plutonium in its SNAP RTG power source is widely dispersed.
-https://en.wikipedia.org/wiki/Johann_Friedrich_Pfaff
-– The first discoveries of extrasolar planets are announced by astronomers Aleksander Wolszczan and Dale Frail. They discovered two planets orbiting the pulsar PSR 1257+12.