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Summer Solstice 2013: Measuring the size of the Earth

At noon on the summer solstice day of 2013 (21 June, 13.00 local time) the Sun is directly over the tropic of Cancer.
So, we put Eratosthenes' ideas into action again!

measuring the size of the earth_1

We measured the length of a metal rod and placed the rod vertical to the ground.

measuring the size of the earth_2

We measured the length of its shadow and used Eratosthenes' model to estimate the Earth's perimeter and radius.

measuring the size of the earth_3

Using software like Google Earth we obtained the distance from our schoolyard to the tropic of Cancer and we estimated the Earth's perimeter and radius quite accurately (error 5%)!

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