An interesting measure, on D-Day (6th june) using a water rocket as gnomon
32 schools over 4 continents participated to the march equinox measure
19 schools over 4 continents participated to the december solstice measure
logo eratos video
With students from Taiwan, China, Malaysia, India, Greece, Serbia, Slovenia, France, Argentina, Brazil
Rio de Janeiro, Brazil, Centro Educacional Nosso Mundo with: Grupo 31 Marechal Rondon Grupo de Escoteiros 52 Fabiano de Cristo

Video from local New Delhi Television Limited (NDTV) in Meerut


Students from Kaohsiung, Taiwan and Shenhzen, China realized Eratosthenes measurements during the passage of Typhoon Usagi.
analemnatic sundial

The realization of an analemnatic sundial is an interesting activity to conduct with your students within the project Eratosthenes.
Here are photos and links of 5 sundials realized in France, Italy and India.


Do you know which is the most active country in the Eratosthenes project?
Here is a hint :
आओ पृथ्वी की परिधि नापे
(Come, measure the circumference of the Earth)

A proposal from Argentina

"Una propuesta del Departamento de Física de la Facultad de Ciencias Exactas y Naturales de la Universidad de Buenos Aires (Argentina), del Laboratorio Pie-rre Auger, Universidad Tecnológica Nacional, Regional Mendoza (Argentina) y de la Asociación Física Argentina."

You can register here :



La main à la pâte Stiftung Sonnentaler