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The experiment of Eratosthenes in Bucharest

The students of the Octav Onicescu National College from Bucharest, Romania greet you! 
The 9th grade students performed the Eratosthenes experiment referring to the Equator. 
After carrying out the experiment together with the students, we created a small simulator of it and the Sun was represented by the flashlight of the mobile phone 

Simulating Eratosthenes' experiment using the phone's flashlight 
Educational Object Context
secondary education