Template:Selected anniversaries/February 18: Difference between revisions

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||3102 B.C. The Kaliyuga begins according to the Indian mathematician Aryabhata (born A.D. 476). He believed all astronomical phenomena were periodic, with period 4,320,000= 20 × 603 years, and that all the planets had mean longitude zero on this date. [College Mathematics Journal, 16 (1985), p. 169.] *VFR https://pballew.blogspot.com/2019/02/on-this-day-in-math-february-18.html
File:Thābit's Arabic translation of Apollonius' Conics.jpg|link=Thābit ibn Qurra (nonfiction)|901: Physician, astronomer, and mathematician [[Thābit ibn Qurra (nonfiction)|Thābit ibn Qurra]] dies. He made important discoveries in algebra, geometry, and astronomy; in astronomy, Thabit was one of the first reformers of the Ptolemaic system.
File:Thābit's Arabic translation of Apollonius' Conics.jpg|link=Thābit ibn Qurra (nonfiction)|901: Physician, astronomer, and mathematician [[Thābit ibn Qurra (nonfiction)|Thābit ibn Qurra]] dies. He made important discoveries in algebra, geometry, and astronomy; in astronomy, Thabit was one of the first reformers of the Ptolemaic system.


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||1626: Francesco Redi born ... physician. Pic.
||1626: Francesco Redi born ... physician. Pic.
 
||1670: “Joannes Georgius Pelshower [Regimontanus Borussus] giving me a visit, and desiring an example of the like, I did that night propose to myself in the dark without help to my memory a number in 53 places: 2468135791011121411131516182017192122242628302325272931 of which I extracted the square root in 27 places: 157103016871482805817152171 proxim´e; which numbers I did not commit to paper till he gave me another visit, March following, when I did from memory dictate them to him.” So wrote John Wallis. [American Journal of Psychology, 4(1891), 38] *VFR https://pballew.blogspot.com/2019/02/on-this-day-in-math-february-18.html Pic.
 
||1677: Jacques Cassini born ... astronomer, son of the famous Italian astronomer Giovanni Domenico Cassini. Pic.
||1677: Jacques Cassini born ... astronomer, son of the famous Italian astronomer Giovanni Domenico Cassini. Pic.


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||1766: A mutiny by captive Malagasy begins at sea on the slave ship Meermin, leading to the ship's destruction on Cape Agulhas in present-day South Africa and the recapture of the instigators.
||1766: A mutiny by captive Malagasy begins at sea on the slave ship Meermin, leading to the ship's destruction on Cape Agulhas in present-day South Africa and the recapture of the instigators.
||1772 the Royal Danish Academy of Sciences and Letters presented Alexander Wilson with a gold medal for his work on sunspots. Wilson was a Scottish surgeon, type-founder, astronomer, mathematician and meteorologist and the first scientist to record the use of kites in meteorological investigations. Wilson noted that sunspots viewed near the edge of the Sun's visible disk appear depressed below the solar surface, a phenomenon referred to as the Wilson effect. When the Royal Danish Academy of Sciences and Letters announced a prize to be awarded for the best essay on the nature of solar spots, Wilson submitted an entry which won.  https://pballew.blogspot.com/2019/02/on-this-day-in-math-february-18.html Pic.


||1788: John Whitehurst dies ... geologist and clockmaker. Pic.
||1788: John Whitehurst dies ... geologist and clockmaker. Pic.

Revision as of 07:59, 18 February 2019