Monday is Pi Day.
March 14 is a day to celebrate the mathematical constant pi (π) and to eat lots of pie, according to timeanddate.com.
National Pi Day is observed in countries whose calendars follow the month/day (M/dd) date format, as the date digits of March 13 or 3/14, match the first three digits of pi, which is 3.14.
Pi Day was first observed in 1988 by physicist Larry Shaw, said timeanddate.com.
German-born theoretical physicist Albert Einstein was also born March 14 (March 14, 1879–April 18, 1955).
In countries where day/month (dd/m) is the date format Pi Approximation Day is observed on July 22, because it is written 22/7, matching the fraction 22/7 that depicts pic.
Various other pi days throughout the calendar include March 4, the day that marks the passing of 14 percent of the third month of the year; April 5, when 3.14 months of the year have passed; and Nov. 10, which is the 314th day of the year (Nov. 9 in leap years), timeanddate.com points out.
So how do we celebrate pi?
- Since pi is a homophone of "pie," eating pie is a common way to mark the day.
- Pie baking contests with "pi" shapes,
- Pie eating contests.
- A pi recitation competition. Participants recite the most digits of the constant to win pies.
- Wear a t-shirt or an accessories like earrings with the numbers of "pie."
- Eat foods that start with the letter "pi" -- pineapples and pizza for starters.
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