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!!