Geography
How does each of the following prove the circular shape of the earth:
(i) Lunar Eclipse
(ii) Pole Star
Planet Earth
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Answer
(i) Lunar Eclipse
The shadow of the earth on the surface of the moon is clearly visible from earth during lunar eclipse. It appears as an arc of a circle. Since the earth is bigger than the moon, it is rarely oriented in the same position as the moon but the shadow is always circular. This proves the circular shape of the earth.
(ii) Pole Star
The Pole Star can be seen at an angle of 90 degrees at the North Pole. It lies in line with the axis of the earth, and its angle decreases towards the equator. At the equator, the angle is 0 degrees. This can happen only in an arc of a circle. This proves the circular shape of the earth.
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