Welcome to the Eratosthenes Experiment platform!

  • Register by completing the name, longitude and latitude of your school. 
  • Calculate the circumference of the Earth.
  • Submit your data.

In addition you can

  • Run the Eratosthenes experiment through the Inspiring Science Education platform as an online classroom activity (each student must be assigned to one computer) and monitor your classroom’s performance and your students problem solving skills.



This year the experiment will take place on the 21st of June, on the summer solstice day. Thus, for your matchup  you can consider the existence of a virtual school on the Tropic of Cancer with experimental data 0 (shade of a one-meter stick measured at a certain time). This way you can have an accurate outcome by conducting the experiment by yourself.

Join today and let your school be part of an exciting international activity!

If  you would like to perform the experiment by yourself ion a date other than the 21st of June, you can use this simulator to find the exact angle from your school to the place where the sun rays are perpendicular to the ground.



The Eratosthenes Experiment 2016 is organised with support from the European Commission in the context of the Seventh Framework Programme (FP7). This Website reflects only the views of the Inspiring Science Education consortium members, the Commission cannot be held responsible for any use that may be made of the information contained herein.

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Contact Persons

Dr. Angelos Lazoudis
T. +30.210.8176795
E. angelos@ea.gr

Giannis Alexopoulos
T. +30.210.8176790