# Happy Tau Day

Tau is introduced in The Tau Manifesto (by Michael Hartl and motivated by Palais, Robert [“Pi Is Wrong!“, The Mathematical Intelligencer, Volume 23, Number 3, 2001, pp. 7-8.]). It suggests that it is more natural to use the constant $\tau$=2$\pi$, rather than $\pi$, for the circle constant.
Also, check out Vi Hart’s video about $\tau$.
If you’re a $\tau$-hater then just think, double the pie mmm…