This section is from the book "The Wonder Book Of Knowledge", by Henry Chase. Also available from Amazon: Wonder Book of Knowledge.
Unless you happen to be of the same height as the person standing next to you, the sky-line is a different distance away from each of you, for it is really just a question of the distance the eye can see from different heights above the sea-level A person five feet tall, standing on the beach at the seaside, is able to see about two and three-quarter miles away, while one a foot taller can see about a quarter of a mile further.
A person on the roof of a house a hundred feet high is able to see more than thirteen miles away, on a clear day, and a forty-two mile view may be enjoyed from the top of a mountain a thousand feet high. The aviator who goes up to a level a mile above the sea is able to see everything within a radius of ninety-six miles and the further up he goes the larger the earth's circle becomes to him.
 
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