Tau Day

June 28, Friday

Tau Day
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Two Pi Day, also known as Tau Day, is observed on June 28 (6/28 in the month/day format). 2π, also known by the Greek letter tau, is a common multiple in mathematical formulae and approximates to 6.28. Some have argued that is the more fundamental constant and that Tau Day should be celebrated instead.
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Tau Day in other years

Tau Day in other countries

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