What’s Pi Day All About? Math, Science, Pies and More

March 14, 2024by Curt Anderson, Associated Press
What’s Pi Day All About? Math, Science, Pies and More
A freshly decorated Key Lime pie rests on a counter in a busy bakery kitchen at Michele's Pies, Wednesday, March 13, 2024, in Norwalk, Connecticut (AP Photo/John Minchillo)

Math enthusiasts around the world, from college kids to rocket scientists, celebrate Pi Day on Thursday, which is March 14 or 3/14 — the first three digits of an infinite number with many practical uses.

Around the world many people will mark the day with a slice of pie — sweet, savory or even pizza.

Simply put, pi is a mathematical constant that expresses the ratio of a circle’s circumference to its diameter. It is part of many formulas used in physics, astronomy, engineering and other fields, dating back thousands of years to ancient Egypt, Babylon and China.

Pi Day itself dates to 1988, when physicist Larry Shaw began celebrations at the Exploratorium science museum in San Francisco. The holiday didn’t really gain national recognition though until two decades later. In 2009, Congress designated every March 14 to be the big day — to hopefully spur more interest in math and science. Fittingly enough, the day is also Albert Einstein’s birthday.

Here’s a little more about the holiday’s origin and how it’s celebrated today.

WHAT IS PI?

Pi can calculate the circumference of a circle by measuring the diameter — the distance straight across the circle’s middle — and multiplying that by the 3.14-plus number.

It is considered a constant number and it is also infinite, meaning it is mathematically irrational. Long before computers, historic scientists such as Isaac Newton spent many hours calculating decimal places by hand. Today, using sophisticated computers, researchers have come up with trillions of digits for pi, but there is no end.

WHY IS IT CALLED PI?

It wasn’t given its name until 1706, when Welsh mathematician William Jones began using the Greek symbol for the number.

Why that letter? It’s the first Greek letter in the words “periphery” and “perimeter,” and pi is the ratio of a circle’s periphery — or circumference — to its diameter.

WHAT ARE SOME PRACTICAL USES?

The number is key to accurately pointing an antenna toward a satellite. It helps figure out everything from the size of a massive cylinder needed in refinery equipment to the size of paper rolls used in printers.

Pi is also useful in determining the necessary scale of a tank that serves heating and air conditioning systems in buildings of various sizes.

NASA uses pi on a daily basis. It’s key to calculating orbits, the positions of planets and other celestial bodies, elements of rocket propulsion, spacecraft communication and even the correct deployment of parachutes when a vehicle splashes down on Earth or lands on Mars.

Using just nine digits of pi, scientists say it can calculate the Earth’s circumference so accurately it only errs by about a quarter of an inch (0.6 centimeters) for every 25,000 miles (about 40,000 kilometers).

IT’S NOT JUST MATH, THOUGH

Every year the San Francisco museum that coined the holiday organizes events, including a parade around a circular plaque, called the Pi Shrine, 3.14 times — and then, of course, festivities with lots of pie.

Around the country, many events now take place on college campuses. For example, Nova Southeastern University in Florida will hold a series of activities, including a game called “Mental Math Bingo” and event with free pizza (pies) — and for dessert, the requisite pie.

“Every year Pi Day provides us with a way to celebrate math, have some fun and recognize how important math is in all our lives,” said Jason Gershman, chair of NSU’s math department.

At Michele’s Pies in Norwalk, Connecticut, manager Stephen Jarrett said it’s one of their biggest days of the year.

“We have hundreds of pies going out for orders (Thursday) to companies, schools and just individuals,” Jarrett said in an interview. “Pi Day is such a fun, silly holiday because it’s a mathematical number that people love to turn into something fun and something delicious. So people celebrate Pi Day with sweet pies, savory pies, and it’s just an excuse for a little treat.”

NASA has its annual “Pi Day Challenge” online, offering people plenty of games and puzzles, some of them directly from the space agency’s own playbook such as calculating the orbit of an asteroid or the distance a moon rover would need to travel each day to survey a certain lunar area.

WHAT ABOUT EINSTEIN?

Possibly the world’s best-known scientist, Einstein was born on March 14, 1879, in Germany. The infinite number of pi was used in many of his breakthrough theories and now Pi Day gives the world another reason to celebrate his achievements.

In a bit of math symmetry, famed physicist Stephen Hawking died on March 14, 2018, at age 76. Still, pi is not a perfect number. He once had this to say:

“One of the basic rules of the universe is that nothing is perfect. Perfection simply doesn’t exist. Without imperfection, neither you nor I would exist.”

___

Associated Press video journalist John Minchillo contributed from Norwalk, Connecticut.

A+
a-

In The News

Health

Voting

Science

May 10, 2024
by Dan McCue
Rare Solar Storm Alert Issued for This Weekend

WASHINGTON — An unusually severe solar storm could cause communications and electrical disruptions this weekend as solar flares reach the... Read More

WASHINGTON — An unusually severe solar storm could cause communications and electrical disruptions this weekend as solar flares reach the Earth, forecasters from the Space Weather Prediction Center said on Friday. Forecasters with the agency, which is part of the National Oceanic and Atmospheric Administration, said... Read More

What's Pi Day All About? Math, Science, Pies and More

Math enthusiasts around the world, from college kids to rocket scientists, celebrate Pi Day on Thursday, which is March 14... Read More

Math enthusiasts around the world, from college kids to rocket scientists, celebrate Pi Day on Thursday, which is March 14 or 3/14 — the first three digits of an infinite number with many practical uses. Around the world many people will mark the day with a... Read More

Plan for $400M Monkey-Breeding Facility in SW Georgia Draws Protest

BAINBRIDGE, Ga. (AP) — Some local residents and an animal-rights group are protesting plans for a monkey-breeding facility in southwest... Read More

BAINBRIDGE, Ga. (AP) — Some local residents and an animal-rights group are protesting plans for a monkey-breeding facility in southwest Georgia. Opponents on Tuesday urged the Bainbridge City Council to block plans by a company called Safer Human Medicine to build a $396 million complex that... Read More

First US Lunar Lander in Over 50 Years Launched but Problem Develops on Way to Moon

CAPE CANAVERAL, Fla. (AP) — The first U.S. lunar lander in more than 50 years rocketed to space Monday, launching... Read More

CAPE CANAVERAL, Fla. (AP) — The first U.S. lunar lander in more than 50 years rocketed to space Monday, launching a race for private companies to deliver experiments and other items to the moon. But about seven hours after liftoff, Astrobotic Technology reported the solar panel... Read More

France's Macron Says Melting Glaciers 'Unprecedented Challenge for Humanity'

PARIS (AP) — Melting glaciers are an “unprecedented challenge for humanity,” French President Emmanuel Macron said on Friday, as he launched a... Read More

PARIS (AP) — Melting glaciers are an “unprecedented challenge for humanity,” French President Emmanuel Macron said on Friday, as he launched a call for nations to work together on slashing planet-warming emissions, protecting the environment and collaborating on scientific research into the Earth's icy ecosystems. Such a united... Read More

AI Raises Fears About Risks to Humanity. Are Tech and Political Leaders Doing Enough?

LONDON (AP) — Chatbots like ChatGPT wowed the world with their ability to write speeches, plan vacations or hold a conversation as good... Read More

LONDON (AP) — Chatbots like ChatGPT wowed the world with their ability to write speeches, plan vacations or hold a conversation as good as or arguably even better than humans do, thanks to cutting-edge artificial intelligence systems. Now, frontier AI has become the latest buzzword as concerns grow that... Read More

News From The Well
scroll top