## Happy Pi Day!

### Happy Pi Day!

## Today is the most magical day of the year:

## Pi Day

A most auspicious holiday for math (and pie) enthusiasts to celebrate their love of numbers while eating pie. It is a worldwide celebration (at least in the USA and a few other countries that write dates the same way) held on this day – March 14th every year. Traditionally, Pi Day is celebrated on 3/14 at 1:59. This year is also the most magical year of the century for Pi Lovers. THIS year marks a once-in-a-lifetime occurrence to celebrate 10 digits of Pi. Today, 3/14/15 at precisely 9:26:53 the date and time will read: 3.14.15 9:26:53

The diameter of a circle is the distance from edge to edge, measuring straight through the center. The circumference of a circle is the distance around. Pi (Greek letter “?”) is the symbol used in mathematics to represent a constant — the ratio of the circumference of a circle to its diameter — which is approximately 3.14159. Pi is a constant number, meaning that for all circles of any size, Pi will be the same. Pi is approximately 3.141592653, but it continues at random to infinity. No matter how many numbers after the decimal place you use, the only way to get it exactly is to use the symbol pi.

### HISTORY OF PI

By measuring circular objects, it has always turned out that a circle is a little more than 3 times its width around. In the Old Testament of the Bible (1 Kings 7:23), a circular pool is referred to as being 30 cubits around, and 10 cubits across. The mathematician Archimedes used polygons with many sides to approximate circles and determined that Pi was approximately 22/7. The symbol (Greek letter “?”) was first used in 1706 by William Jones. A ‘p’ was chosen for ‘perimeter’ of circles, and the use of ? became popular after it was adopted by the Swiss mathematician Leonhard Euler in 1737. In recent years, Pi has been calculated to over one trillion digits past its decimal. Only 39 digits past the decimal are needed to accurately calculate the spherical volume of our entire universe, but because of Pi’s infinite & patternless nature, it’s a fun challenge to memorize, and to computationally calculate more and more digits.

This all sounds mostly Greek to me! However after reading about Pi Day and all the different descriptions, explanations, and celebrations of Pi, I will admit that I finally have a better understanding of the sacred ‘Pi’

## And now ….in honor of Pi

## Let’s Eat PIE!

Facebook user Kay Sweet will be celebrating Pi Day, and her birthday. Photo courtesy of Kay Sweet

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