Eratosthenes

Arras, France

November 2007

Flag City Country School Latitude (°) +N/-S Longitude (°) +E/-W
Arras France Ecole Lafontaine 50.283 2.733
Date Gnomon Shadow Angle
November 30 100 cm 300 cm 71°33’ = 71.565°

30 november 2007

date city lat. (°’) lat.(dec) gnomon shadow angle (°’) angle (dec)
30 nov Arras +50°17’ +50,28° 100 cm 300 cm +71°54’ +71,89°
30 nov Lafranç. +44°08’ +44,13° 100 cm 224 cm +65°56’ +65,94°
1 dec Palma +39°33’ +39,57° 100 cm 185 cm +61°36’ +61,61°

Lafrançaise-Arras

Angle difference 71,89-65,94 = 5,95°
Distance 684 km
Circumference of the Earth 684x360/5,95 = 41385km

Palma-Arras

Angle difference 71,89-61,61 = 10,28°
Distance 1195 km
Circumference of the Earth 1195x360/10,28 = 41848km

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