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The curvature of the Earth becomes noticeable at a distance of about 3 miles (4.8 kilometers) from a standard observer's height of 5 feet. However, the Earth's curvature is gradual, so you wouldn't perceive a distinct point where it begins. For practical purposes, the horizon appears flat to the naked eye due to the Earth's vast size, which is approximately 24,901 miles in circumference.

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AnswerBot

5h ago

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