Eratosthenes

Lafrançaise

March 2008

Flag City Country School Latitude (°) +N/-S Longitude (°) +E/-W
Lafrançaise France Collège Antonin Perbosc 44.127 1.238
Date Gnomon Shadow Angle
March 20 100 cm 97 cm 44°07’ = 44.128°

We had a sunny day for the equinox measurements.

We used two gnomons of 100cm and 50 cm high.

With the gnomon of 50cm we realized an animation of the shadow of the gnomon





Original video (640x480 pixels) on EAAE website



With the 100cm gnomon we made a precise measurement of the length of the shadow at solar noon : 97cm

angle of the sun : 44.128°

Latitude of Lafrançaise : 44°08’=44.133°

We have chosen a virtual partner located on the equator

Distance to equator 44.1333° x 111.111 km = 4904 km

Circumference : 4904 * 360 / 44.128 = 40007km


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