Circumference of the Earth

http://www.nytimes.com/2002/09/24/science/here-they-are-science-s-10-most-beautiful-experiments.html

This project is based on a scientific collaboration : Each school needs 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.

265/366 days of measure in 2020

The project is supported by Institutional partnerships and the students are organized in international Task Forces teams. Results are published in the 265 day pages and in 12 monthly Newsletters.

Collaborative measures are also organized at fixed astronomical dates

Collaborative measures are also organized for special events

Previous Eratosthenes projects

Access to 2005 to 2009 eTwinning projects are no longer possible

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)