The library of Eratosthenes

Arras

Friday 21 December 2007 by perbosc







 30 november 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
Circumference of the Earth 684x360/5,95 = 41385km

Palma-Arras

Angle difference 71,89-61,61 = 10,28°
Distance 1195 km
Circumference of the Earth 1195x360/10,28 = 41848km

 20 december 2007

Measurements

Time Shadow
10h10 5,76 m
11h20 3,87 m
12h30 3,58 m
12h40 3,46 m
12h45 3,27 m
12h50 3,20 m
13h05 3,25 m
13h10 3,32 m
13h30 3,41 m
13h45 3,54 m
14h00 3,75 m
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 december 2007

Measurements

Time Shadow
10h40 4,85 m
11h55 3,78 m
12h35 3,52 m
12h40 3,47 m
12h50 3,35 m
13h00 3,42 m
13h20 3,58 m
13h45 3,76 m
14h00 3,84 m
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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