Mathematicians born on this day:
1732 : Jérôme Lalande 
Mathematicians who died on this day:
1382 : Nicholas Oresme 
Nicole Oresme  Joseph Larmor  George Atwood 
Simon Newcomb (1835  1909)
Ten decimal places of π are sufficient to give the circumference of the earth to a fraction of an inch, and thirty decimal places would give the circumference of the visible universe to a quantity imperceptible to the most powerful microscope.
Quoted in D MacHale, Comic Sections (Dublin 1993)
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School of Mathematics and Statistics University of St Andrews, Scotland  