People generally celebrate March 14 as Pi Day, because March 14 is also written as formula_47, which represents the first three numbers 3.14 in the approximation of formula_1. formula_1 day was started in 1988 by physicist Larry Shaw at the San Francisco Exploratorium. On March 11, 2009, almost 21 years later US House of Representatives passed a resolution proclaiming March 14 to be celebrated as National formula_1 Day every year.= = = Proper noun = = =
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