# How to celebrate Tau Day

There's a movement afoot in mathematics to replace pi (3.14...) with tau (6.28...)
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Most everyone knows about Pi Day, March 14, or 3.14, and the various ways to celebrate it. But there is a growing movement amongst rebel math enthusiasts -- some who even call themselves math naturalists -- to displace pi in favor of tau . Whereas pi is the mathematical constant for the ratio of the circumference of a circle to its diameter, tau represents the ratio of the circumference to its radius. Since circles are defined as a set of points all an equal distance from the center, some argue that tau is a more natural way to measure a circle constant than pi. Here are six ways to celebrate Tau Day.

RELATED: 10 ways to celebrate Pi Day

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