**Pi Day** is a Math Holiday held on March 14, or 3-14 in tribute to the common 3.14 approximation for pi. The pi constant represents the ratio between the circumferences of a circle to its diameter. It is represented by the Greek letter “**π**” and is a number of extreme usefulness and intrigue in science and engineering.

What are the first 100 digits of pi, you may ask?

3.1415926535897932384626433832795028841971693993751058209749445923078164062862089986280348253421170679

Here are ten interesting points for your Pi Day:

## 1. Pi Day is celebrated on March 14th every year.

It represents 3.14, which is pi’s value.

## 2. Physicist Larry Shaw, also known as the Prince of Pi, organized the first widely attended Pi Day celebration in 1988.

## 3. In the Greek alphabet, pi (piwas) is the 16th letter.

In the English alphabet, p is also the 16th letter.

## 4. Pi is called an irrational number, meaning its digits go on forever in a seemingly random sequence.

So we can never truly measure the circumference or the area of a circle because we can never truly know the value of pi.

## 5. Ludolph Van Ceulen spent most of his life calculating the first 36 digits of pi.

This is known as Ludolphine Number.

## 6. With the help of Hitachi SR 8000, a powerful computer, a Japanese scientist found 1.24 trillion digits of pi, breaking all the previous records.

*The Guinness Book of World Records* states that Lu Chao holds the world record for memorizing the most number of digits of pi. He memorized 67,890 digits, which took him 24 hours and 4 minutes to recite.

## 7. There are no zeros in the first 31 digits of pi.

## 8. Pi Day is also Albert Einstein’s birthday.

It is also the birthdays of Apollo 8 Commander Frank Borman, Astronomer Giovanni Schiaparelli, and last-man-on-the-moon Gene Cernan.

## 9. At position 763 there are six nines in a row. This is known as the Feynman Point.

## 10. The earliest textual evidence of pi dates back to 2000 BC; both the Babylonians and the Egyptians had a rough idea of the value.

The Babylonians estimated pi to be about 25/8 (3.125), while the Egyptians estimated it to be about 256/81 (roughly 3.16).