Eratosthenes

Hồ Chí Minh City

March 2008

Flag City Country School Latitude (°) +N/-S Longitude (°) +E/-W
HôChiMinhCity Vietnam HAAC 10.767 106.650
Date Gnomon Shadow Angle
March 16 cm cm 12.597°

Traduction-Translation-Dịch bản

Hồ Chí Minh City
longitude : 106,7 E
Latitude : 10° 48′ = 10,8°N
date : 16/03/2008
angle : 12,6°
Lafrançaise
latitude : 44°08’ = 44,133°
date : 16/03/2006
gnomon : 100cm
ombre : 103cm
angle : 45°51’ = 45,85°
difference of latitude : 44,133 -10,8 = 33,333°
distance : 33,333 x 111,1 = 3704 km
difference between angles : 45,85 -12,6 = 33,25°
circumference : 360 x 3704 / 33,25 = 40103 km

Location of the vertical gnomon

Measurement of the length of the shadow

Calculation of the angle

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