Eratosthenes

Jahidpur India

June 2009

Flag City Country School Latitude (°) +N/-S Longitude (°) +E/-W
Jahidpur India Bal Vigyan Bhawan 28.917 77.717
Date Gnomon Shadow Angle
June 21 cm cm + 5,3°
Jahidpur India
Bal Vigyan Bhawan Hapur delhi bypass
Longitude 77°43’ E
Latitude 28°55’ N
Angle group A + 4,46°
Angle group B + 6,16°
Angle average + 5,3°

Calculation with Lafrançaise partner
- difference of latitude 44°08’ - 28°55’ = 15°13’ = 15.2167°
- distance between the parallels : 15.2167° x 111.111 km = 1691 km
- difference of the angle of the Sun : 20,6° - 5,3° = 15,3°
- circumference of the Earth : 1691 x 360° / (20,6° - 5,3°) = 39 788 km

Lafrançaise France
Collège Antonin Perbosc
Longitude 1°15’ E
Latitude 44°08’ N
Angle + 20°40’ = +20,6°

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