Home   Calendar   Holidays   Fun   Pi Approximation Day

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.
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
2018SunJul 22Pi Approximation Day
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

See all Fun Holidays

January 2018
SMTWTFS
 123456
78910111213
14151617181920
21222324252627
28293031   
February 2018
SMTWTFS
    123
45678910
11121314151617
18192021222324
25262728   
March 2018
SMTWTFS
    123
45678910
11121314151617
18192021222324
25262728293031
April 2018
SMTWTFS
1234567
891011121314
15161718192021
22232425262728
2930     
May 2018
SMTWTFS
  12345
6789101112
13141516171819
20212223242526
2728293031  
June 2018
SMTWTFS
     12
3456789
10111213141516
17181920212223
24252627282930
SMTWTFS
1234567
891011121314
15161718192021
22232425262728
293031    
August 2018
SMTWTFS
   1234
567891011
12131415161718
19202122232425
262728293031 
September 2018
SMTWTFS
      1
2345678
9101112131415
16171819202122
23242526272829
30      
October 2018
SMTWTFS
 123456
78910111213
14151617181920
21222324252627
28293031   
November 2018
SMTWTFS
    123
45678910
11121314151617
18192021222324
252627282930 
December 2018
SMTWTFS
      1
2345678
9101112131415
16171819202122
23242526272829
3031     

See all Fun Holidays

Advertising

July 22, 2018 – Other Holidays this day


Create Calendar with Holidays


Add Event to Calendar

Other Fun Holidays around July 22

20 Jul

Space Exploration Day

Learn more about space and space exploration on this fun and scientific holiday.

21 Jul

Junk Food Day

Celebrate this day by guiltlessly consuming junk food.

23 Jul

Vanilla Ice Cream Day

Celebrate the world’s most sought after and popular ice cream flavor - vanilla ice cream.

24 Jul

Cousins Day

The unofficial holiday recognizes the importance of cousins in our lives.