Random Facts About the Limits of Vision
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Interesting Random Facts About the Limits of Vision
Random Facts about the Limits of Vision
Random Facts about the Limits of Vision
Limits of Natural Vision.--This question is too
indefinite for a specific answer. The limits of vision vary
with elevation, conditions of the atmosphere, intensity of
illumination, and other modifying elements in different
cases. In a clear day an object one foot above a level plain
may be seen at the distance of 1.31 miles; one ten feet
high, 4.15 miles; one twenty feet high, 5.86 miles; one 100
feet high, 13.1 miles; one a mile high, as the top of a
mountain, 95.23 miles. This allows seven inches (or, to be
exact, 6.99 inches) for the curvature of the earth, and
assumes that the size and illumination of the object are
sufficient to produce an image. Five miles may be taken as
the extreme limit at which a man is visible on a flat plain
to an observer on the same level.
Facts and Useful Information, written in 1889 by Barkham Burroughs
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