ERATOS PROJECT [home page]

  • Circumference of the Earth

    This project is based on a scientific collaboration : We need the measurement of a partner school to obtain the final result. Schools from 4 continents are involved.

    This project runs from January to December. Its aim is to calculate the circumference of the Earth, reproducing Eratosthenes experiment.

    199/365 days of measure in 2018

    The project is supported by Institutional partnerships and the students are organized in international Task Forces teams. Results are published in the 199 day pages and in 12 monthly Newsletter.

    Collaborative measures are also organized at fixed astronomical dates


    Collaborative measures are also organized for special Asian and American events

    Previous Eratosthenes projects

    Access to 2005 to 2009 eTwinning projects are no longer possible



    The transdisciplinary of the project supports the development and the validation of the 8 key competences. Inclusive education is part of the project objectives, which welcomes students of all ages, from kindergarten to high school, on 5 continents.

    Eratosthenes Earth Experiment eTwinning group

    Experimental activities will lead you to this result:
    1. Show the curve of earth's surface and the parallelism of solar rays.
    2. Observe the evolution of the shadow of a staff and deduce the course of the sun.
    3. Discover the moment of solar midday (the time when the shadow is at its shortest).
    4. Use a gnomon to deduce the angle of solar rays compared to the vertical.
    5. Use the result of the measure from a partner to calculate the circumference of the Earth

    The teachers guide and the pedagogic module details those activities  in the EEE group

    Draw the Geogebra figures (Models and tutorial)

    Answers to some Frequently Asked Questions are in the F.A.Q. of the Eratosthenes Library

    Inspiring Transdisciplinar activities (Singing, Drawing, Acting, Visiting, Designing, Hallowing, Observing, Gaming, Coding, Gardening)