Now
About 2200 years ago
Images taken by artificial satellites from space have proved that the Earth is round.
Greek mathematician and scientist Eratosthenes discovered that the lengths of the shadows in Alexandria and Aswan were different. These two cities were in the north and south of Egypt respectively. This disproved the ‘Flat Earth Theory’.
Imagine the land is flat. When the Sun shines on the ground directly, the length of shadows in different places should be the same. However, this is not the fact …
The Earth is really round!
imagine the land is round
imagine the land is flat
Will an accepted scientific theory or hypothesis be overturned? If yes, how will it be overturned?
Did the ‘Round Earth Theory’ gain any support from the shadow tests?
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