As you know, many people celebrate PI Day by having ~~Pi~~ pie. (See my post on Pi Day, here.) But there is a rival movement afoot to replace Pi Day with Tau Day (and indeed, to replace Pi with Tau as a standard).

Pi, of course, is the ratio of a circle’s circumference to its diameter (3.14159265…), currently celebrated on March 14. Tau, or τ, is the ratio of a circle’s circumference to its radius. Thus it is twice the amount of π (6.28318530…). (Hence the celebration on June 28.)

Mathematicians are divided on the issue, but to me it makes infinite [sic] sense to celebrate Tau Day, because it implies **TWO** pieces of pie. **TWO** pies. This sounds like a good thing.

### Two Times PI:

Some 2012 winners from the yearly contest sponsored by the Serious Eats Blog:

Twice pie (pi) sounds like a great idea! Except that it might give me twice the chin or twice the belly roll…

I’ll take two pis please.

I like Pi Day better…because of the pie. This seems like one of those fake holidays..not like Pi Day!

Too bad I don’t like pie.

Love it, though I couldn’t imagine pi not being around in future!

Happy Tau day! Two pieces of pie are better than one. But I will always be partial to pi because it has the cooler symbol🙂

Word. Hell with you, pi! We’re moving on to new things!

(I have no dog in this fight really. But I like REBELLION.)

I love pie, but this will give me an excuse to make two.

I agree that if I can eat double the pie, then it’s a celebration!

You always post such fun and informative pieces!!