Welcome to the Eratosthenes Experiment platform!

  • Register by completing the name, longitude and latitude of your school.
  • Come in contact with a registered school at the same longitude with you
    (this info will be provided to you by the organizing team)
  • Join efforts with the matching school and record your data
  • Calculate the circumference of the Earth
  • Submit your data and take part to the photo competition

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 22rd of September, on the autumnal equinox day. Thus, for your matchup –if no other schools can be found on the same longitude- you can consider the existence of a virtual school on the equator with experimental data 0 (shade of a one-meter stick measured at a certain time). This way you can also have an accurate outcome by conducting the experiment by yourself.

Schools that register till Monday 12th  of September 12:00 CET will receive on Wednesday 14th  of September an e-mail with the coordinates of potential matching schools along with the information (email) of their contact persons, so that they can communicate and arrange their match-up during the day of the experiment. Schools that register after the referred  date and time above,  will receive the same email on Friday16th and Monday 19th of September.

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 22nd of September, 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.

Schools that  register after Thursday 21st of July 14:00 CET, will be displayed on the map on Friday 26th of August)


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