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Because the Earth is very large.

If the Earth were flat, we would expect a curvature rate of zero inches per mile. As it is, the Earth is not flat, and it's curvature rate is 8 inches per mile.

63,360 inches are in a mile, and the 8 inch drop is spread over that distance. Our eyes are not able to detect an approximately 1/10,000th of an inch drop off per inch.

In simple terms, the curvature is so gradual that we can't see it!

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7y ago

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