Eratosthenes

Arras (FRANCE)

 Ecole Lafontaine

Arras France Ecole Lafontaine 50°17’N 02°44’E

 2006, september 28



On September 28 we measured the hour and the length of the shade. With 13:45 the shade of 123cm was smallest. It was the hour of solar midday.
With the height of the gnomon and the length of the shade, we found an angle of 51° At the time of the equinox, this angle is equal to the latitude.

 2006, december 21




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