Ten Decimals of π Are Sufficient To Give the Circumference of the Earth To the Fraction of an Inch

Simon Newcomb? John Casey? George McC. Robson? Apocryphal? Dear Quote Investigator: The number π is a fundamental mathematical constant which equals the ratio of a circle’s circumference to its diameter. Trillions of digits of the decimal expansion of π have been calculated using electronic computers and innovative algorithms. Yet, this precision is not needed in …