Question

How has it been proved that the earth is round.give reason.
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Answer 1

Answer:

Eratosthenes, a Greek astronomer from Hellenistic Cyrenaica (276–194 BC), estimated Earth's circumference around 240 BC. He had heard that in Syene the Sun was directly overhead at the summer solstice whereas in Alexandria it still cast a shadow.

Answer 2

Answer:

The event of lunar eclipse can only been seen from half of the earth. Greek concluded that since the only shape that casts a round shadow no matter which direction it is pointed is a sphere, earth must be spherical.