Pi Day

Pi Day

  • Mole Day - Mole Day is an unofficial holiday celebrated among chemists, chemistry students and chemistry enthusiasts on October 23, between 6:02 AM and 6:02 PM, making the date 6:02 10/23 in the American style of writing dates.
  • Square Root Day - Square Root Day is an unofficial holiday celebrated on days when both the day of the month and the month are the square root of the last two digits of the year. For example, the last Square Root Day was April 4, 2016, and the next Square Root Day will be May 5, 2025.
  • Sequential time - A sequential time is one in which the numbers form a normal sequence, such as 1:02:03 4/5/06. Short sequential times such as 1:23:45 or 12:34:56 appear every day. Larger sequential times rarely appear, such as 12:34:56 7/8/90, or 01:23:45 on 6/7/89.
  • Observances about science
  • Pi
  • July observances
  • Unofficial observances
  • March observances

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