Template:Selected anniversaries/February 18: Difference between revisions

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||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.  
||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.  
||1673: Robert Hooke writes in his Journal: "Bought Copernicus tower hill 2sh " *‏@HookesLondon Thony Christie points out that current first editions run about 2,500,000 GB Pounds. 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.

Revision as of 11:19, 18 February 2019