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STICK - Measuring the Circumference of the Earth

Stick is a collaborative project of international scope that invites students and their secondary teachers to repeat the experience of measuring the circumference of the earth as Eratosthenes did 2200 years ago, using simply a stick, a lot of imagination and a little information.
Stick es un proyecto colaborativo de alcance internacional que invita a los alumnos y sus docentes de secundario a repetir la experiencia de medir la circunferencia de la tierra como lo realizó Eratóstenes hace 2200 años, utilizando simplemente un palo, mucha imaginación y un poco de información.

This project will be carried out with secondary school students and the main objective is to measure the perimeter of the Earth, in a similar way to that used by Eratosthenes more than two thousand two hundred years ago.
For this, each group of students and their teachers will measure the height and shadow of a stick during the solar midday of the autumn or September equinox. In the event that the sky is cloudy, it can be measured on the first clear day afterwards. Each school will share the values of their measurements by completing the spreadsheet created in Google. (
This activity will allow students to know old units of longitude, the inconveniences of their use and why the convenience of using the current measures of the International System of Measurements.
In addition, make a concrete use of mathematics, put into practice experimentation as a means of obtaining information about nature and feel part of a joint project involving students from distant places.

Central Objectives
• Describe the different units of length.
• Describe the geometry of how the su...