Happy Tau Day! What is tau (τ), you ask? Tau is twice the value of the famous mathematical constant pi (π), 6.28... Hence, 6/28 is "Tau Day" in echo of celebration of "Pi Day" on 3/14.
As it turns out, we've been mythologizing exactly the wrong circle constant, and τ is the more natural choice. Of course, the math works out either way, since you just need a factor of two to convert between them. So why would you choose τ over π? Why should you choose τ over π?
