Eratosthenes 2010-2011

Lafrançaise France

Monday 22 June 2009
  • date : 22 06 2009
  • solar noon : 13h57 UTC
  • gnomon : 100cm
  • shadow : 37,7cm
  • angle : 20°40’ = 20,667°
Lafrançaise France
Collège Antonin Perbosc
Longitude 1°15’ E
Latitude 44°08’ N
Angle + 20°40’ = +20,67°

Calculations with Caseros

  • difference of latitude 44°08’ - (-34°36’) = 78°44’ = 78.7333°
  • distance between the parallels : 78.7333° x 111.111 km = 8748 km
  • difference of the angle of the Sun : 20,67° - (-58,0°) = 78,67°
  • circumference of the Earth : 8748 x 360° / 78,67 = 40 032 km


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