Today is Tau Day 'Tau day' marked by opponents of maths constant pi
Today marks the second annual celebration of pi’s nemesis, tau, which is two times the size of pi: 6.28 — which handily enough is today, June 28.Many Internet users celebrate Pi Day.  Now there's a push to celebrate Tau Day. Tau Day was started about 10 years ago when Michael Hartl claimed that the mathematical constant pi  was wrong in "The Tau Manifesto". He says tau, which is 6.28, should replace pi. Learn more about the growing debate between these two mathematical equations.

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