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Tau Day or Two Pi Day

Tau Day or Two Pi Day is held on June 28. This event in the third decade of the month June is annual. Help us Help us 
28 June - Tau Day or Two Pi Day
Two Pi Day, also known as Tau Day for the mathematical constant Tau, is observed on June 28 (6/28 in the month/day format).
June 28 is "Two Pi Day", also known as "Tau Day". 2π, also known by the Greek letter tau (τ) is a common multiple in mathematical formulae.
Some have argued that τ is the more fundamental constant, and that Tau Day should be celebrated instead.
Celebrations of this date jokingly suggest eating "twice the pie".

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