The library of Eratosthenes

Cañada de Gómez

Friday 16 November 2007 by perbosc

Centro Interactivo de Ciencia y Tecnología

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 9 nov / 10 nov 2007

date city lat. (°’) lat.(dec) gnomon shadow angle (°’) angle (dec)
9 nov Lafranç. +44°08’ +44,13° 100 cm 180 cm +60°57’ +60,95°
9 nov Palma +39°33’ +39,57° 100 cm 154 cm +57°00’ +57,00°
10 nov Cañada -32°49’ -32,67° ??? cm ??? cm -15°33’ -15,55°

Lafrançaise-Cañada

Angle difference 60,95-(-15,55) = 76,5°
Distance 8550 km
Circumference of the Earth 8550x360/76,5 = 40235km

Palma-Cañada

Angle difference 57,00-(-15,55) = 72,55°
Distance 8041 km
Circumference of the Earth 8041x360/72,55 = 39900km

 16 nov 2007

date city lat. (°’) lat.(dec) gnomon shadow angle (°’) angle (dec)
16 nov Lafranç. +44°08’ +44,13° 100 cm 194 cm +62°43’ +62,73°
16 nov Cañada -32°49’ -32,67° ??? cm ??? cm -14°19’ -14,32°

Lafrançaise-Cañada

Angle difference 62,73-(-14,32) = 77,05°
Distance 8550 km
Circumference of the Earth 8550x360/77,05 = 39948km

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