Pi Day may be just around the corner, but there’s still time to prepare to celebrate this ancient math concept. Pi is a constant number and it is the ratio of a circle’s circumference to its diameter. The first recorded use of Pi was in 250 B.C.E by the Greek mathematician, Archimedes. Pi has an infinite amount of digits, and no repeating pattern. Since Pi is usually represented with the approximation 3.14, Pi Day is commemorated on the 14th of March. Here five things you can do to commemorate it this Saturday:

1. Bake a Pi pie. (Don’t forget to eat it, too!)
2. Run a Pi mini-marathon, 3.14 kilometers (or miles, if you’re feeling imperial and athletic).
3. Pi Day is also Albert Einstein’s birthday, so light some candles along with your Pi pie.
4. Wake up at 9 a.m. Why? Because this year Pi Day will occur on 3/14/15, and at 9:26:53 there will be a sequential time made up of the first 10 digits of Pi (3.141592653).
5. Pi Day actually sort of happens twice a year. July 22nd is Casual Pi Day since 22/7 is a common approximation of Pi. You can start memorizing some digits of Pi for Casual Pi Day.