Eratosthenes

Arras (FRANCE)

Ecole Lafontaine

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

May 9 , 2005

  • Lafrançaise
    • - solar noon =13:52 ;
    • - gnomon =1 m ;
    • - shadow =50 cm ;
    • - angle =26.565°
  • Arras
    • - solar noon =13:46 ;
    • - gnomon =1 m ;
    • - shadow =63.5 cm ;
    • - angle = 32.416°

    • distance between the parallels = Arras-Lafrançaise = 683 km
    • difference between the angles = 32.416°- 26.565° = 5.856°
    • circumference of the Earth = 683 x 360 / 5.856 = 41989 km

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