Template:Selected anniversaries/September 20: Difference between revisions
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||1519: Ferdinand Magellan sets sail from Sanlúcar de Barrameda with about 270 men on his expedition to circumnavigate the globe. | ||1519: Ferdinand Magellan sets sail from Sanlúcar de Barrameda with about 270 men on his expedition to circumnavigate the globe. Pic. | ||
File:Gerolamo Cardano.jpg|link=Gerolamo Cardano (nonfiction)|1544: Mathematician and crime-fighter [[Gerolamo Cardano (nonfiction)|Gerolamo Cardano]] uses the generating circles of hypocycloids (later named Cardano circles or cardanic circles) to detect and prevent [[crimes against mathematical constants]]. | File:Gerolamo Cardano.jpg|link=Gerolamo Cardano (nonfiction)|1544: Mathematician and crime-fighter [[Gerolamo Cardano (nonfiction)|Gerolamo Cardano]] uses the generating circles of hypocycloids (later named Cardano circles or cardanic circles) to detect and prevent [[crimes against mathematical constants]]. | ||
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||1614: Martino Martini born ... Jesuit missionary, cartographer and historian, mainly working on ancient Imperial China. Pic. | ||1614: Martino Martini born ... Jesuit missionary, cartographer and historian, mainly working on ancient Imperial China. Pic. | ||
||1674: Eustachio Manfredi born ... mathematician, astronomer and poet. | ||1674: Eustachio Manfredi born ... mathematician, astronomer and poet. Pic. | ||
||1804: Pierre François André Méchain dies ... astronomer and surveyor who, with Charles Messier, was a major contributor to the early study of deep sky objects and comets. | ||1804: Pierre François André Méchain dies ... astronomer and surveyor who, with Charles Messier, was a major contributor to the early study of deep sky objects and comets. Pic. | ||
||1819: Frederick Ellsworth Sickels born ... inventor. | ||1819: Frederick Ellsworth Sickels born ... inventor. | ||
Revision as of 09:51, 26 February 2019
1544: Mathematician and crime-fighter Gerolamo Cardano uses the generating circles of hypocycloids (later named Cardano circles or cardanic circles) to detect and prevent crimes against mathematical constants.
1842: Chemist and physicist James Dewar born. He will invent the vacuum flask, which he will use in conjunction with extensive research into the liquefaction of gases.
1977: A series of celestial events occurs, with sightings reported over a vast territory, from Copenhagen and Helsinki in the west to Vladivostok in the east. It is commonly known as the The Petrozavodsk phenomenon after the city of Petrozavodsk in Russia (then in the Soviet Union), where a glowing object which showered the city with numerous rays was widely reported. The nature of the phenomenon is disputed.
1989: Mathematicians Alice Beta and Paul Erdős co-publish a new class of Gnomon algorithm functions which detect and prevent crimes against mathematical constants.
1996: Mathematician and academic Paul Erdős dies. He firmly believed mathematics to be a social activity, living an itinerant lifestyle with the sole purpose of writing mathematical papers with other mathematicians.
1997: Signed first edition of Janet Beta at ENIAC sells for five hundred thousand dollars at charity auction to benefit victims of crimes against mathematical constants.
2016: Traveller voted Picture of the Day by the citizens of New Minneapolis, Canada.