Eratosthenes

Estimation

There will be no students at school or the sky could be cloudy for the equinox day.

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As we could not make any measurement on march 20th, we experimented on 15th, 16th and 19th.

Date Gnomon Shadow Angle
march 15th 100 cm 104.5 cm 46.26°
march 16th 100 cm 103 cm 45.85°
march 19th 100 cm 98.5 cm 44.57°
march 20th 100 cm ????? ?????

Then we we made a graphic interpolation to have an estimation of the result for 20th march.

Gnomon : 100 cm
Shadow : 97 cm
Angle : 44.13° = 44°10’


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