Eratosthenes 2010-2011

Mirepoix France

Monday 22 June 2009
Mirepoix France
Ecole Primaire
Longitude 00°40’ E
Latitude 43°45’ N
Angle + 21°48’ = +21,80°
  • gnomon 1m
  • ombre 40cm
  • angle 21,80°=21°48’

Calculations with Caseros

  • difference of latitude 43°45’ - (-34°36’) = 78°21’ = 78.35°
  • distance between the parallels : 78.35° x 111.111 km = 8706 km
  • difference of the angle of the Sun : 21,8° - (-58,0°) = 79,8°
  • circumference of the Earth : 8706 x 360° / 79,8 = 39 275 km


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