Pi Day is an annual celebration of the mathematical constant π (pi). Pi Day is observed on March 14, (3/14 in the month/day date format since 3, 1, and 4 are the first three significant digits of π. The earliest known official or large-scale celebration of Pi Day was organized by Larry Shaw in 1988 at the San Francisco Exploratorium, where Shaw worked as a physicist, with staff and public marching around one of its circular spaces, then consuming fruit pies.
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