Today is Square Root Day!

I know this is a writing blog, not a math/science blog, but this is too cool to not celebrate. (Don’t worry, my wordy friends — tomorrow, March 4, is National Grammar Day!)

Today, March 3, 2009 (3/3/09), is Square Root Day. (If you’ve been out of school for a while, three is the square root of nine.) 😉

In the words of CNET News:

Tuesday is 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. Numerically, March 3, 2009, can be expressed as 3/3/09, or mathematically as √9 = 3, or 3² = 3 × 3 = 9.

Square Root Day occurs only nine times in each century, and on the same dates each time. The last one occurred on a Groundhog Day, February 2, 2004 (2/2/04), and the next will occur in seven years on April 4, 2016 (4/4/16). The last square root day of this century will occur on September 9, 2081 (9/9/81).

Redwood City teacher, Ron Gordon, told the AP about a contest he started in honor of Square Root Day, in which the winner receives $339.

How can you celebrate? Some people take root vegetables and cut them into squares. Or you can prepare food in the shape of the square root symbol.

According to Scientific American:

Because of the nature of perfect squares, the wait time between square root days increases by two years each time as the century unfolds—five years separated the previous square root day from today’s, seven years will pass before the next square root day in 2016, and nine years will elapse before the following one in 2025. But after the final square root of this century, September 9, 2081 (9/9/81), there will be a slightly prolonged layover before the 22nd century starts its own run of square root days on January 1, 2101 (1/1/01).

The complete list of dates is as follows:

Scientific American
Associated Press

Stay tuned for tomorrow, March 4, when we celebrate National Grammar Day!


I'm a wife and mommy first, as well as a social media consultant/manager, editor, and writer. I'm also editor of Musical Reviewer and Houston Theatre Blog.

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