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Paul Libbrecht

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Eratosthenes Experiment

Dear educators in mathematics and science,

How do you measure the earth's circumference?

Simply using the sun, a stick, similar triangles, and… communication.

Eratosthenes did it centuries ago. It possible to do that with pupils next Friday, March 21st.

To this end: register on, find a partner school, go out and measure.

This activity is organized within the Open Discovery Space project and is also reported up in the latest Math Forum newsletter.


3 Comment(s) to "Eratosthenes Experiment"


Iva Dumont Feb-19-2016

Awsome, that sounds interesting!