Question

How was it proved that the Earth is spherical in shape?
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Answer 1

Answer:

The Earth is massive enough that the pull of gravity maintains its roughly spherical shape. Most of its deviation from spherical stems from the centrifugal force caused by rotation around its north-south axis. This force deforms the sphere into an oblate ellipsoid.

Explanation:

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Answer 2

Answer:

1. The Earth is massive enough that the pull of gravity maintains its roughly spherical shape.
2. Circumnavigation of the earth: Ferdinand Megallian, a Spanish sailor with his crew sailed around the earth between 1519 and 1522, he and his crew were the first people to do so, If the earth is flat, he and his crew would have fallen off the flat edge but instead they sail round the spherical edge because if the earth is truly flat, Ferdinand and his crew would have fallen off the flat edge. Also, modern air routes and area navigation are based on the assumption that the earth is spherical in shape