Math geeks, rejoice – tomorrow is Pi Day once again, but this year it’s an ultimate Pi Day that won’t happen again for another century! (Non-math-geeks: March 14, or 3/14, is Pi Day – it corresponds to the first three digits of pi, 3.14; this year, 3/14/15, it’s extra-special because it includes the next two digits too, 3.1415.)

Like all good nerds, we have to celebrate Pi Day with pi-themed pies. Whatever your favorite pie flavor – Key lime, lemon meringue, peach, cherry… – you can geek it up for Pi Day. Here’s how:

Too much effort? Just use a pi pie dish or plate!

Mind. Blown.

Go all-out geeky:

Or keep it classy:

We tend to focus on apple pie, custard pie, chocolate pie, pecan pie… but don’t forget the pizza pie!

If you’re truly a die-hard math geek, you won’t limit your pi to the kitchen:

You can start counting down the seconds to 9:26:53… it’s a once-in-a-lifetime nerdy opportunity! While you wait for the exact moment to strike, you can pass the time with other number-heavy pursuits. Some enthusiasts will be busy calculating extra digits of the constant on custom-built rigs, while others might be running probability models for the top bitcoin casinos or writing python scripts to generate fractal art. However you choose to celebrate this mathematical milestone, just make sure your eyes are on the clock.

Happy Ultimate Pi Day!