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Tau Day | No, really, pi is wrong: The Tau Manifesto by Michael Hartl

tags: tau, pi, math
T-shirt with tau on it

Tau Day is an annual celebration of the circle constant τ = 6.283185…, which takes place every June 28 (6/28 in the American calendar system). To learn more about what τ is and why it is important, read The Tau Manifesto, or watch one of the tau videos below.


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