### Happy Epic Pi Day!

Okay, I’m a day early.

For those who don’t know what in the world I am talking about – or have blocked out your physics classes – Pi (Greek symbol: π) is the ratio of a circle’s circumference to its diameter. Pi is a constant number, meaning that for all circles of any size, Pi will be the same. The number Pi begins 3.1415926535897932384626433832795028841971693993751058…. it actually has over one million digits past the decimal point.

Pi Day is an annual celebration commemorating the mathematical constant π (pi). Pi Day is observed on March 14 (or 3/14 in the *month/day* date format), since 3, 1, and 4 are the first three significant digits of π in decimal form.

Fun Fact

*On March 12, 2009, the U.S. House of Representatives passed a non-binding resolution (HRES 224), recognizing March 14, 2009 as National Pi Day. Last year, some observed the entire month as Pi Month (3-14).*

So, if Pi Day happens every year, why am I wishing you an ‘epic pi day’? Because tomorrow, 3-14-15 is the only time in our lifetimes that we will see Pi out 10 digits past the decimal, twice if you are not on military time: 3-14-15 9:26:53 am/pm.

For number nerds (like me) this is kind of exciting. See? I even made a Pizza Pi in celebration 😉

Interested? Head over to Pi Day to check out more fun Pi information.

There are also two other math and science holidays celebrated in high schools across the country: Mole Day and Square Root Day.

Mole Day is October 23rd each year. Mole Day commemorates Avogadro’s Number (6.02 x 10^{23}), which is a basic measuring unit in chemistry.

Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year. For example, the last Square Root Day was March 3, 2009 (3/3/09), and the next Square Root Day will be April 4, 2016 (4/4/16). The final Square Root Day of the century will occur on September 9, 2081. Square Root Days fall upon the same nine dates each century.

Check back in October for my Mole Day post and April of next year for my post about Square Root Day.