A friend asked me via Twitter what I thought of this io9 article about why pi was wrong. That’s right, pi: the circumference of a circle divided by its diameter. In Euclidean geometry that’s equal to approximately 3.1415926535897… and is irrational. The person io9 interviewed for the article is a proponent for a new constant called tau (after the Greek letter) that is the circumference divided by the radius. In other words, a constant for twice pi.
There’s a website promoting the correctness of tau as the correct value, claiming pi to be wrong just as the article does. The website isn’t not talking about the mathematical incorrectness of pi, but the site and io9 are using headline trickery to pull readers in.
The Tau Manifesto is disappointing. All it shows is that the choice of pi vs. tau is arbitrary at best, and we as a society chose pi over history because pi was discovered first. Besides, writing 2*pi is nicer than tau/2. This tau movement isn’t going to catch on. It’s not even on Wikipedia!