The library of Eratosthenes

Lafrançaise

Friday 21 December 2007 by perbosc

Collège Antonin Perbosc









 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-Lafrançaise

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

 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

 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°

Lafrançaise-Arras

Angle difference 71,89-65,94 = 5,95°
Distance 684 km
Circonférence de la Terre 684x360/5,95 = 41385km

Palma-Lafrançaise

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

 14 dec 2007

date city lat. (°’) lat.(dec) gnomon shadow angle (°’) angle (dec)
14 dec Lafranç. +44°08’ +44,13° 100 cm 239 cm +67°17’ +67,28°
14 dec Barranha +41°19′ +41,32° 27,3 cm 55,7 cm +63°54’ +63,90°

Lafrançaise-Barranha

Angle difference 67,28-63,90 = 3,38°
Distance 313 km
Circumference of the Earth 313x360/3,38 = 33337km

 20 dec 2007

date city lat. (°’) lat.(dec) gnomon shadow angle (°’) angle (dec)
20 dec Lafranç. +44°08’ +44,13° 100 cm 240 cm +67°22’ +67,38°
20 dec Arras +50°17’ +50,28° 100 cm 320 cm +72°38’ +72,63°

Lafrançaise-Arras

Angle difference 72,63-67,38 = 5,25°
Distance 684 km
Circumference of the Earth 684x360/5,25 = 46903km

 21 dec 2007

date city lat. (°’) lat.(dec) gnomon shadow angle (°’) angle (dec)
21 dec Lafranç. +44°08’ +44,13° 100 cm 242 cm +67°33’ +67,55°
21 dec Arras +50°17’ +50,28° 100 cm 335 cm +73°22’ +73,37°

Lafrançaise-Arras

Angle difference 73,37-67,55 = 5,82°
Distance 684 km
Circumference of the Earth 684x360/5,82 = 42309km

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