Eratosthenes (en)
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The experiment of ERATOSTHENES
Put a staff to the sun, measure its shadow when the sun is at its highest point, deduce the angle of the solar rays compared with the vertical staff, then exchange your results with another class under another latitude. Then, a few geometrical drawings and a rule of three give you the length of earth's meridian.
Download video (wmv 14Mo 2min) assouan-alexandrie-640x480.wmv
Original videos:
David Jasmin (La Main à la Pâte): http://diffusion.ens.fr/index.php?res=conf&idconf=746
Mogi Vicentini (Planetario di Milano): http://www.mogi-vice.com/Pagine/Downloads.html
Videoconferences
Download .wmv video (80Mo, 22 min, 320x240 )
videos of the schools (automn equinox 2008)
videoconference Centra (spring equinox 2009) : video wall - play list
History
Historical texts about Eratosthenes, Hipparchus, ...
The library of ERATOSTHENES
Reports of measurements
Help for calculations
The schools
View Larger Map & List of the Schools
Forum
Eratosthène 09
