Eratosthenes

Arras, France

September 2007

Flag City Country School Latitude (°) +N/-S Longitude (°) +E/-W
Arras France Ecole Lafontaine 50.283 2.733
Date Gnomon Shadow Angle
September 24 100 cm 98.5 cm 44°34’ = 44.567°
Arras France Ecole Lafontaine 50°17’N 02°44’E
LatitudeOmbre/ShadowAngle
44°08’ NLafrançaise (FR)+98,5 cm —>N+ 44°30’
50°17’ NArras (FR)+123,0 cm—>N+ 51°00’

The day after the equinox, in spite of bad weather conditions, we were able to do a few measurements. The value of the angle of the sun’s rays with the vertical (51 °) is close to the value of Arras latitude (50 ° 17 ’).


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