How was it provided that the earth is spherical in shape?
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by looking at the pole star, we can determine that the earth is spherical in shape
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The idea of the Earth being a flat disk is also inconsistent with the fact that a given lunar eclipse is only visible from half of the earth at the time. The only shape that casts a round shadow no matter which direction it is pointed is a sphere , and the ancient Greeks deduced that this must mean the earth is spherical
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