Square Root Day
Square Root Day, a rare holiday that occurs when the day and the month are both the square root of the last two digits of the current year.
“These days are like calendar comets, you wait and wait and wait for them, then they brighten up your day–and poof–they’re gone,” Ron Gordon, a Redwood City, Calif., teacher who organized a contest intended to publicize the event, told the Associated Press.
Square Root Day occurs only nine times in a century.
Pi Day is observed each March 14 (3.14), while Pi Approximation Day falls on July 22 (roughly equal to 22/7).
The first Pi Day was observed in 1988 by staff at the San Francisco Exploratorium, who walked around in circles.
Source: CNET
