Friday, March 13, 2009

In celebration of Pi Day

Ho, Ho, children, it is Pi Day,

Pi, Greek letter (pi), is the symbol for the ratio of the circumference of a circle to its diameter. Pi = 3.1415926535... Pi Day is observed on March 14 (3/14), due to π being roughly equal to 3.14. Pi Approximation Day is observed on July 22, due to π being roughly equal to 22/7. Wikipedia.

Some also celebrate Pi Approximation Day in addition to Pi Day, which can fall on any of several dates:

  • April 26: The Earth has traveled two radians of its orbit by this day (April 25th in leap years); thus the entire orbit divided by the distance traveled equals pi
  • July 22: 22/7 in the more common day/month date format, an ancient approximation of pi
  • November 10: The 314th day of the year (November 9 in leap years)
  • December 21, 1:13 p.m.: The 355th day of the year (December 20 in leap years), celebrated at 1:13 for the Chinese approximation 355/113
You may wish to eat pie on Pi Day, but if not you can still look at the Exploratorium' s 21st Annual Pi Day Celebration page. Look here for a brief history of Pi. As I have always said, let them eat pie.

No comments:

Post a Comment