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Celebrating Square Root Day

Square Root Day is when the month and the day are the square root of the year. It only happens nine times in a century, and today (3-3-09) is one of those days.

The holiday is the brainchild of Sequoia High (Redwood City, California) driver education teacher Ron Gordon, who enjoys calendar quirks. He's tried to get schools to celebrate Square Root Day since 1981. Gordon also inspired a celebration of Odd Day on March 5, 2007 (3-5-7). He is giving away a prize of $339 to the person who has the best Square Root Day celebratory event. What can you do to celebrate Square Root Day? Math teachers expect students to calculate square roots. We should do something fun in addition.

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Robert X. Cringely at Infoworld has a plan for celebrating Square Root Day.

I don't know about you, but I'm planning to celebrate by watching a "SpongeBob SquarePants" marathon while playing with my slide rule.

That's only the beginning of the many ways you can celebrate Square Root Day.

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The established custom is to cut root vegetables (carrots, turnips, radishes) into squares. Actually eating them may be asking too much. But potatoes are roots, aren't they? Square (or cubic) potatoes can mean only one thing -home fries.

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For dessert you need to make a carrot cake. Square, of course. There are plenty of different recipes, all you have to do is find one that fits the ingredients you have. Enjoy it with some root beer. Oh yes, I'll have a slice, thank you very much!

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Buy yourself a square root puzzle. You won't receive it in time to play today, but you'll be ready for the next holiday in 2016.

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You can play Square Root Clock online. There are plenty of online games that challenge your math skills using square roots, but this is the most photogenic.

Then there's always a little square root poetry. This example is from Harold and Kumar Escape from Guantanamo Bay (contains spoiler, if you care).

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After all the food and math, grab seven of your friends and have a square dance. Some basic instructions are at Square Dancing 101. Allemande left, 2 by 2! Image by Wikimedia user Deirdre.

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If you are so inclined, you might go looking for a real square root in the world around you. They are kind of rare. Image by Flickr user arsheffield.

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And if that's not enough fun for you, we're only a couple of weeks away from Pi Day! But celebrate Square Root Day wisely. The next such holiday will be on April 4, 2016.

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A Simple Trick For Figuring Out the Day of the Week For Any Given Date
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People typically remember anniversaries in terms of dates and years, not days of the week. If you can’t remember whether you got married on a Saturday or Sunday, or don't know which day of the week you were born on, there’s a simple arithmetic-based math trick to help you figure out sans calendar, according to It's Okay To Be Smart host Joe Hanson.

Mathematician John Conway invented the so-called Doomsday Algorithm to calculate the day of the week for any date in history. It hinges on several sets of rules, including that a handful of certain dates always share the same day of the week, no matter what year it is. (Example: April 4, June 6, August 8, October 10, December 12, and the last day of February all fall on a Wednesday in 2018.) Using this day—called an “anchor day”—among other instructions, you can figure out, step by step, the very day of the week you’re searching for.

Learn more about the Doomsday Algorithm in the video below (and if it’s still stumping you, check out It’s OK to Be Smart’s handy cheat sheet here).

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A Man-Made Mountain in Finland Serves as an 11,000-Tree Time Capsule
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In 1982, the conceptual artist Agnes Denes set out to make a mountain. After a decade of work, she made it happen. In 1992, the Finnish government announced that it would sponsor Denes’s Tree Mountain—a 125-foot-tall manmade mountain built on top of a former gravel pit, designed to serve as part time capsule, part ecological recovery project.

Tree Mountain — A Living Time Capsule was constructed on the site of a former gravel pit near Ylöjärvi, Finland between 1992 and 1996. The artificially constructed landmass stands 125 feet tall, almost 1400 feet long, and more than 885 feet wide. (The top image of the triptych above shows the mountain in 1992 and the bottom image in 2013.) The forest planted on it forms a precise mathematical pattern Agnes designed based on the golden ratio-derived spirals of sunflowers and pineapples. From above, the oval mountain looks like a giant fingerprint made up of whorls of trees.

The project was never intended to just be aesthetically pleasing. Envisioned as a way to rehab land destroyed by mining, the trees are meant to develop undisturbed for 400 years, creating what will eventually be an Old Growth forest that can reduce erosion, provide wildlife habitats, and boost oxygen production.

And it was a communal effort. The roughly 11,000 pine trees were planted by different individuals who then became the custodians of those trees. Each received a certificate declaring their ownership for the project’s full term of 400 years. They can pass along this ownership to their descendants or to others for as many as 20 generations. These custodians (which include former UK prime minister John Major and former Icelandic president Vigdís Finnbogadóttir) are even allowed to be buried under their trees. But the trees can never be moved, and the mountain itself can’t be owned or sold off for those 400 years.

A triptych of images of Tree Mountain
Tree Mountain - A Living Time Capsule - 11,000 Trees, 11,000 People, 400 Years (Triptych) 1992-1996, 1992/2013
Copyright Agnes Denes, courtesy Leslie Tonkonow Artworks + Projects, New York

“Tree Mountain is the largest monument on earth that is international in scope, unparalleled in duration, and not dedicated to the human ego, but to benefit future generations with a meaningful legacy,” Denes writes. It “affirms humanity's commitment to the future well being of ecological, social and cultural life on the planet.”

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