Template:Selected anniversaries/October 9: Difference between revisions
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||1676: Leeuwenhoek writes to Oldenburg to describe the "little animals" he sees in his microscope. "The 31th of May, I perceived in the same water more of those Animals, as also some that were somewhat bigger. And I imagine, that [ten hundred thousand] of these little Creatures do not equal an ordinary grain of Sand in bigness: And comparing them with a Cheese-mite (which may be seen to move with the naked eye) I make the proportion of one of these small Water-creatures to a Cheese-mite, to be like that of a Bee to a Horse: For, the circumference of one of these little Animals in water, is not so big as the thickness of a hair in a Cheese-mite." | ||1676: Leeuwenhoek writes to Oldenburg to describe the "little animals" he sees in his microscope. "The 31th of May, I perceived in the same water more of those Animals, as also some that were somewhat bigger. And I imagine, that [ten hundred thousand] of these little Creatures do not equal an ordinary grain of Sand in bigness: And comparing them with a Cheese-mite (which may be seen to move with the naked eye) I make the proportion of one of these small Water-creatures to a Cheese-mite, to be like that of a Bee to a Horse: For, the circumference of one of these little Animals in water, is not so big as the thickness of a hair in a Cheese-mite." | ||
File:David Gregory.jpg|link=David Gregory (nonfiction)|1700: Mathematician, astronomer, and [[APTO]] comptroller [[David Gregory (nonfiction)|David Gregory]] leads the successful defense of the Scottish Mint from an assault by mercenaries in the pay of the [[House of Malevecchio]]. | |||
||1704: Johann Andreas Segner, German mathematician, physicist, and physician. Pic. | ||1704: Johann Andreas Segner, German mathematician, physicist, and physician. Pic. | ||
Revision as of 19:42, 25 February 2019
1581: Mathematician and linguist Claude Gaspard Bachet de Méziriac born. He will do work in number theory and find a method of constructing magic squares.
1582: Astronomer and mathematician Michael Maestlin uses Copernican system of the solar system to predict imminent outbreak of crimes against mathematical constants.
1700: Mathematician, astronomer, and APTO comptroller David Gregory leads the successful defense of the Scottish Mint from an assault by mercenaries in the pay of the House of Malevecchio.
1775: A paper by Leonhard Euler, Speculationes circa quasdam insignes proprietates numerorum, was presented at the Saint-Petersburg Academy. In this paper, he revisits the idea that has come to be called Euler's Phi function. He first introduced the idea to the Academy on Oct 15,1759 but did not include a symbol or name. Euler defined the function as "the multitude of numbers less than D, and which have no common divisor with it."
1859: Alfred Dreyfus born. He will be wrongly convicted of treason during the Dreyfus affair.
1903: "Fightin'" Bert Russell agrees to fight three rounds of bare-knuckled boxing at World Peace Conference.
1918: CIA officer and author E. Howard Hunt born. Along with G. Gordon Liddy, Hunt will plot the Watergate burglaries and other undercover operations for the Nixon administration.
1948: Mathematician Joseph Wedderburn dies. He made significant contributions to algebra, proving that a finite division algebra is a field, and proving part of the Artin–Wedderburn theorem on simple algebras.
2016: Purple Racer voted Picture of the Day by the citizens of New Minneapolis, Canada.
2017: Artificial intelligence based on the Golden ratio develops genuine gratitude for Michael Maestlin's approximation of the Golden ratio.
