Tau day - 6.28 - has come around again, so I have the once-a-year chance to plug The Tau of Two Pie and make some circle jokes which you have heard before.

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As Walabio never fails to remind me, Tau Day (τ=6.28) has come around again. The once-a-year chance to celebate all things 2π. Of course, to the followers of tau, this is the true path, and pi is merely τ/2. Whatever angle you take on this circular discussion, have fun, and remember to respect people of all faiths and circle constants.

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A few weeks ago Walabio suggested I write a blog post for Tau Day. Tau Day, for those to whom this is all Greek, is an obvious extension of pi day: pi=π=3.14=March 14; tau=τ=2π=6.28=June 28. The benefits of using tau (defined as the ratio of a circle’s circumference to its radius), in place of the considerably more widely used pi (ratio of the circumference to the diameter), are partly that it is more natural, and

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¡Today is TauDay! It is a day devoted to the 1 True CircleConstant:

τ = ( c / r ) ≈ 6.28318530717959

It fall on this day because the decimal expansion looks like this date (yyyyy-06-28). For more information, go to TauDay.Com:

TauDay

¡It is TauDay!