Abstract
IN these days of aviators and of record heights attained by them, perhaps the following rule to find the area of the earth's surface visible from a given height may be of interest. The rule depends upon the fact that if the height above a sphere is 1/xth part of the sphere's diameter, then the area visible from this height is 1/x+2th part of the sphere's total area. This admits of an easy geometrical proof.
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MOSS, W. Area of Earth's Surface Visible at any Altitude. Nature 91, 583 (1913). https://doi.org/10.1038/091583a0
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DOI: https://doi.org/10.1038/091583a0
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