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The earth reflects

Answer:

The Earth was found out to be spherical because it always casts a shadow (during eclipses of the Moon) that was either circular or portion of a circle (partial eclipse). There's only one solid shape that always appears to be circular, regardless of view point, and that's a sphere.

I'm not sure about the Moon, but I assume that it was pretty much the same process - it always appears as a circle or part of a circle.

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13y ago

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