They all rotate, and watching over the course of a few days gives a clear picture they are spherical rather than flat. This can be made even easier by simply comparing when it is night and day in each country. If the Earth were flat, the view should be the same. The view is completely different because the Earth beneath you is pointing in a different direction. They managed to get it to within 10% of the true value – not bad for around 250 B.C.Īnother piece of evidence for a globe is the difference between the night skies in the northern and southern hemispheres. They then used the difference in these angles to calculate the circumference of the Earth. The ancient Greeks found the shadows were different because the Earth was curved and so the sticks were at different angles. If the Earth were flat then both sticks should show the same shadow (or lack of) because they would be positioned at the same angle towards the sun.
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