1.

How can you prove that the earth is a sphere by looking at the Pole Star​

Answer»

ong>Explanation:

The Pole STAR can be SEEN at an angle of 90° at the North Pole, as it lies directly at the line of axis of the earth, while its angle decreases towards the Equator i.e. it is 0° at the equator. It is only possible in an QUARTER ARC of a circle. It proves that the earth is a sphere with circular surface



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