Now Everyone Can Do it!

Eratosthenes Original Experiment was Ingenious

But not easy to do. Because it must be performed on a special day, and at two different places, perfectly aligned on the globe. And then both measurements must be taken at precisely the same time.

We wanted a much easier method

One that anyone could do, any time. Without traveling, or having a distant partner. And with no modern help, like using a smartphone. We wanted to preserve the simple wonder of the original experiment, but in a way that everyone could enjoy.

And now we have it!

Using our methods, you simply measure a shadow cast by an ordinary ruler, when and where it's best for you. Then we give you everything else you'll need.

The entire experiment takes just a few minutes. It's super-easy, and the results are amazingly accurate. So now everyone on Earth, can measure the Earth, too!