Template:Selected anniversaries/September 20: Difference between revisions

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||1674: Eustachio Manfredi born ... mathematician, astronomer and poet. Pic.
||1674: Eustachio Manfredi born ... mathematician, astronomer and poet. Pic.
||1796: Juan José Elhuyar dies ...chemist and mineralogist ... with his brother Fausto Elhuyar, first to isolate tungsten  in 1783. Pic search maybe: http://www.laboratorium.eus/en/pertsonaia/juan-jose-elhuyar-1754-1796


||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.
||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, cut-off valve for steam engines. Pic search art: https://artsandculture.google.com/entity/m0bmgp82 and  https://www.invent.org/inductees/frederick-ellsworth-sickels


File:James Dewar.jpg|link=James Dewar (nonfiction)|1842: Chemist and physicist [[James Dewar (nonfiction)|James Dewar]] born. He will invent the vacuum flask, which he will use in conjunction with extensive research into the liquefaction of gases.
File:James Dewar.jpg|link=James Dewar (nonfiction)|1842: Chemist and physicist [[James Dewar (nonfiction)|James Dewar]] born. He will invent the vacuum flask, which he will use in conjunction with extensive research into the liquefaction of gases.

Revision as of 15:34, 15 June 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.

    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.

    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.

    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.

    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.

    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.

    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.

    2016: Traveller voted Picture of the Day by the citizens of New Minneapolis, Canada.

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