To register your school for the Eratosthenes experiment sign up here.
Go to the Login page in Eratosthenes web site and enter your username and password in the appropriate fields.
Fill in the fields with your details and then select “Publish”.
Go to the “Home” page and check the map for your school and its coordinates.
When you finish the experiment, Log in to the website again and submit your data. Finally, click the “Publish” button.
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September 2026 Equinox, Eratosthenes Experiment
The Eratosthenes experiment September 2026 will take place on the March equinox day, Wednesday the 23th of September (see here). You can perform the experiment in collaboration with another school that shares the same longitude or if no other schools can be found on the same longitude - for your matchup – you can consider the existence of a virtual school on the equator with experimental data 0 (shade of a one-meter stick measured at local noon) and conduct the experiment by yourself. Schools that register till 13th of September 15:00 CET will receive the next day 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. Same for schools that register on 16th of September, and 18th of September and 19th of September, 2026. This list of dates will be updated as we approach the day of the experiment.