Question

who confirmed that Earth is spherical in shape

Answer 1

the early Greek philosophers said that the earth is in spherical shape .Pythagoras was one among that group said to have originate the idea

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Answer 2

Early Greek philosophers alluded to a spherical Earth, though with some ambiguity.Pythagoras (6th century BC) was among those said to have originated the idea, but this might reflect the ancient Greek practice of ascribing every discovery to one or another of their ancient wise men.