Eratosthenes

Lafrançaise, France

November 2007

Flag City Country School Latitude (°) +N/-S Longitude (°) +E/-W
Lafrançaise France Collège Antonin Perbosc 44.127 1.238
Date Gnomon Shadow Angle
November 09 100 cm 180 cm 60°56’ = 60.945°
November 16 100 cm 194 cm 62°43’ = 62.731°
November 30 100 cm 224 cm 65°56’ = 65.943°

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

Home page | Contact | Site Map | | Statistics | visits: 3500

Site created with SPIP 2.1.10 + AHUNTSIC