Happy Tau Day. Eat twice as much pi.
Today is Tau Day for one of the newer mathematical movements as proposed in The Tau Manifesto by Michael Hartl, stemming from a 2001 paper pointing out that pi is wrong. The proposal is that pi (π) is wrong in the sense that it is better to use the radius rather than the diameter to define the circle constant. They propose that this new constant, which of course is equal to double pi, should be symbolized by the Greek letter tau (τ). Tau can be used anywhere pi is used and makes working with radians neater as there is one tau in a full circle. The movement is similar to a religious movement in many ways. Once people have been converted, they become zealots and are almost violently angry at pi. They have a sense of being lied to all their lives and wish to enlighten others. They call tau the true circle constant and encourage you to embrace the tau. Followers of tauism seek the way of the tau. They assert that using pi is like having the yang without the yin. Today followers of tau celebrate all things mathematical and true. They hold parties and eat twice as much pie. You can join their mailing list on the Tau Manifesto website.