# Happy Pi Day!

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Do quiches count as pies?

March 14th marks a special day for those who love Pi or pie. Pi is one of the most studied numbers. Pi Day is held annually on March 14th to celebrate the mathematical constant Pi (?).

The first known Pi Day celebration was in 1988 at San Francisco’s Exploratorium and was organized by two of their physicists, Ron Hipschman and Larry Shaw. Since then, Pi Day has been celebrated around the world in a myriad of classrooms and workspaces. If nothing else, Pi Day is a fantastic excuse to eat delicious pie.

Pi is an irrational number as it continues to infinity, and 3.14 is widely accepted as an accurate estimate. Pi has been known for close to 4,000 years, and mathematicians have refined its calculation over the years. It wasn’t until the mid 1600’s that there was a universal name or symbol. Mathematicians eventually assigned the Greek letter ? to represent Pi in the 1700’s, and the symbol was popularized by Leonhard Euler.

Pi is used in geometry, physics, astronomy, architecture, construction and mathematics. Pi Day has become MIT’s unofficial holiday with their annual 24-Hour Challenge.

The specific Greek letter was chosen as it’s the first letter of the Greek word “perimetros” which roughly translates to circumference. And remember that the formula used to calculate the circumference of a circle is: 2 x ? x radius!

Do tarts count as pies  mini pies?

## What is Piphilology?

People are very passionate about memorizing as many digits of Pi as possible. Piphilology is the creation and use of mnemonic techniques to memorize a set of digits of the mathematical constant. In 2015, Rajveer Meena memorized 70,000 decimal places of Pi. Meena spent 10 hours blindfolded while reciting all decimal places; this garnered him a spot in the Guinness World Records!

People have been known to create mnemonic sentences and poems to help them remember Pi’s digits. These poems are called “piems” and are less effective for large memorization. Many have created sentences where the number of letters in each word correlates to a specific digit of Pi. If the value is 1, then the word must be 1 letter long. Any digits that are zero are represented by a 10-letter word.

The following piem represents the 3 and the first 20 decimal digits of Pi:

Sir, I have a rhyme excelling, In mystic power and magic spelling, Celestial spirits elucidate, For my own problems can’t relate.

## Fun facts

#### Trivia about Pi and Pi Day:

• March 14th also happens to be Albert Einstein's birthday.
• Circles are naturally occurring in nature. As the exact value of Pi can't be calculated, determining the area or the circumference of a circle will never be 100% accurate. Triangles and squares rarely appear in nature, but it's easy to calculate the area of these shapes.
• If someone were to print a billion decimals of Pi using a standard font and size, it would roughly stretch from New York City to Kansas.

Mathematician: “?r2.” Baker: “No, pies are round. Cakes are square.”

#### Trivia about Influxers who love pie and Pi Day:

• An Influxer was once challenged by his father to see how many decimal places of Pi he could memorize  he got up to knowing at least 400 digits of Pi.
• An Influxer was born on March 14th. As luck would have it, they prefer having pie over a typical birthday cake.
• Multiple Influxers have been known to eat an entire pie by themselves on multiple occasions.

## Pi Day at InfluxData

As a remote-friendly organization, Influxers love to come together over Slack and have fun regardless of timezones. We recently asked our distributed team: What is your favorite type of pie?

 Apple Pie: 6 Custard Pies: 1 Pecan Pie: 8 Black Forest cake which is indeed a pie: 1 Dutch Apple Pie: 1 Pie Charts: 1 Blackberry Cobbler: 1 Huckleberry Pie: 1 Pizza Pie: 3 Blueberry Pie: 3 Humble Pie: 1 Pumpkin Pie: 6 Cheesecake: 1 Kailua Cream Cheese from Marie Callender's: 1 Rhubarb Pie: 3 Cherry Pie: 2 Key Lime Pie: 5 Shepherd's Pie: 2 Chess Pie: 1 Lemon Meringue: 2 Strawberry Rhubarb: 1 Chicken and Mushroom Pie: 1 Mud Pie: 2 Sweet Potato Pie: 1 Chicken Pot Pie: 2 My mom's chocolate peanut butter pie with cream cheese: 1 Tomato Pie: 1 Chocolate Meringue Pie: 1 Peach Cobbler: 1

Pecan was the most popular type of pie among Influxers! Some people are very passionate about their answers. One Influxer vehemently stated that cheesecakes are a type of pie. Some love all types of pies and for some it’s hard to pick just one. As one pointed out: “Pies are seasonal, so it’s hard to just pick one”. One Influxer pointed out that pecan pie must be “made with way too many pecans”. An InfluxData employee taught us that Black Forest Cake is also known as Schwarzwälder Kirschtorte in German and is in fact a pie. An Influxer said apple pie was their favorite, but they’d never turn down any pie!

## Fun Pi Day activities

1. Take a string across the diameter of a pie and mark it. Take the string around the pie and mark it. Then "divide" the strings (i.e. fold them) to determine Pi. Circumference = Diameter x Pi. You should get 3 with a little left over!
2. Eat pie.
3. Make pie.
4. Memorize and recite digits of Pi to impress friends and family.