Math geeks rejoice! What to do on "Pi Day"

Todor Tsvetkov | Vetta | Getty Images

In case you haven't heard, or perhaps are not mathematically inclined, Saturday is the day that sends math geeks into paroxysms of ecstasy.

That is because March 14, 2015 marks "Pi Day"—the sole day this century where the date matches the mathematical formula for the ratio of a circle's circumference to its diameter. In the event those old geometry classes elude, Pi is expressed numerically as "3.1415...", carried out to as far as 1 trillion digits past the decimal. Anyone with a life, however, normally stops after four.

The New York Times points out that the fun really begins (or perhaps began already Saturday morning?) at 9:26:53. That chronological moment in time marks the first 10 digits of Pi.

According to PiDay.org, only 39 digits after the decimal are needed to compute the spherical volume of the entire universe. However, "because of Pi's infinite & patternless nature, it's a fun challenge to memorize, and to computationally calculate more and more digits."

Naturally, that depends on how one defines "fun challenges."

In the meantime, what do people do to celebrate such an auspicious occasion? Some will be baking pies (no doubt with their exact circumference calculated), and there are exhibits where entry fees will be waived for the day. If all else fails, perhaps watching "The Life of Pi" on Netflix qualifies as legitimate Pi Day fun.

If that isn't enough for the numerologists among us, you can even buy a T-shirt to mark the day (no, really). After all, it only comes around once every 100 years.