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Jul
22
Fun Holiday – Pi Approximation Day

July 22 is Pi Approximation Day. Also known as Casual Pi Day, the day is dedicated to the mathematical constant pi (π).

Celebrate pi (π) by eating lots of pie.

Pi denotes the relationship between a circle’s circumference and its diameter and is denoted by the fraction 22/7 which calculates approximately to 3.14. One of the most widely recognized mathematical constant, π, is an irrational number, the digits of which repeat in a random fashion and are never ending.

Depends on Date Format

People in countries that write their dates in the date/ month format celebrate Pi Approximation or Casual Pi Day on 22 July or 22/7. On the other hand, those who write their date in month/ date format celebrate Pi Day on March 14 (3/14 or 3-14) because the first three digits of the date correspond to the first three digits of pi - 3.14.

Move to Replace Pi

In recent years, some mathematicians and physicists have argued for the replacement of the π by tau and to celebrate Tau Day on June 28 instead of celebrating Pi Day or Pi Approximation Day.

How to Celebrate?

Here are some ways you can celebrate this irrational, but fun holiday:

  • Celebrate the day with lots of pie – remember a pie is also a circle so not only are you learning something about math, but also having fun while eating it!
  • Have a pi contest. Whoever knows the most digits in the number takes home a pie.

Did You Know...

...that the sequence 123456 does not occur in the first million digits of pi?

Pi Approximation Day Observances

Fun Holiday: Pi Approximation Day Observances
YearWeekdayDateName
2019MonJul 22Pi Approximation Day
2020WedJul 22Pi Approximation Day
2021ThuJul 22Pi Approximation Day
2022FriJul 22Pi Approximation Day
2023SatJul 22Pi Approximation Day
2024MonJul 22Pi Approximation Day
2025TueJul 22Pi Approximation Day
2026WedJul 22Pi Approximation Day
2027ThuJul 22Pi Approximation Day
2028SatJul 22Pi Approximation Day

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January 2019
SMTWTFS
  12345
6789101112
13141516171819
20212223242526
2728293031  
February 2019
SMTWTFS
     12
3456789
10111213141516
17181920212223
2425262728  
March 2019
SMTWTFS
     12
3456789
10111213141516
17181920212223
24252627282930
31      
April 2019
SMTWTFS
 123456
78910111213
14151617181920
21222324252627
282930    
May 2019
SMTWTFS
   1234
567891011
12131415161718
19202122232425
262728293031 
June 2019
SMTWTFS
      1
2345678
9101112131415
16171819202122
23242526272829
30      
SMTWTFS
 123456
78910111213
14151617181920
21222324252627
28293031   
August 2019
SMTWTFS
    123
45678910
11121314151617
18192021222324
25262728293031
September 2019
SMTWTFS
1234567
891011121314
15161718192021
22232425262728
2930     
October 2019
SMTWTFS
  12345
6789101112
13141516171819
20212223242526
2728293031  
November 2019
SMTWTFS
     12
3456789
10111213141516
17181920212223
24252627282930
December 2019
SMTWTFS
1234567
891011121314
15161718192021
22232425262728
293031    

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