The library of Eratosthenes

Palma de Mallorca

Saturday 1 December 2007 by perbosc

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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°

Palma-Lafrançaise

Angle difference 60,95-57,00 = 3,95°
Distance entre les villes 510 km
Circumference of the Earth 510x360/3,95 = 46481km

Palma-Cañada

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

 30 nov / 1 dec 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°

Palma-Lafrançaise

Angle difference 65,94-61,61 = 4,33°
Distance 510 km
Circumference of the Earth 510x360/4,33 = 42402km

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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