Template:Selected anniversaries/September 9: Difference between revisions
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||1839 – John Herschel takes the first glass plate photograph. | ||1839 – John Herschel takes the first glass plate photograph. | ||
||John Henry Poynting (b. 9 September 1852) was an English physicist. He was the developer and eponym of the Poynting vector, which describes the direction and magnitude of electromagnetic energy flow and is used in the Poynting theorem, a statement about energy conservation for electric and magnetic fields. Pic. | |||
||Baron Yamakawa Kenjirō (b. September 9, 1854) was a Japanese samurai of the late Edo period who went on to become a noted physicist, university president, and author of several histories of the Boshin War. | ||Baron Yamakawa Kenjirō (b. September 9, 1854) was a Japanese samurai of the late Edo period who went on to become a noted physicist, university president, and author of several histories of the Boshin War. | ||
Revision as of 21:34, 26 March 2018
1737: Physician and physicist Luigi Galvani born. In 1780, he will discover that the muscles of dead frogs' legs twitch when struck by an electrical spark.
1917: Mathematician and philosopher Georg Cantor publishes new theory of sets derived from Gnomon algorithm functions. Colleagues hail it as "a magisterial contribution to science and art of detecting and preventing crimes against mathematical constants."
1947: First case of a computer bug being found: A moth lodges in a relay of a Harvard Mark II computer at Harvard University.
1975: Viking program: Viking 2 launched. Following a 333-day cruise to Mars, the Viking orbiter will begin returning global images of Mars.
2017: The Custodian tells a funny story about why you can't go in there.