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Comment: It depends on your height above the water. You could only see 20 miles if you were well above sea level. If â¦you are standing more or less at sea level, with your eyes just a few feet above the water level, you could see only about 3 or 4 miles. For example: Eye level at 6 feet: horizon at about 3 miles.
Their eyes are 100 feet above the water. Using the formula above, the horizon appears to be 12.3 miles away. Square Root of 100 = 10 10 x 1.23 miles = 12.3 miles. Conversely, a lighthouse light 100 feet above the water would be visible from 12.3 miles out to sea by a viewer at water level. But unless the viewer is in a very small boat they are up above water level, and the higher above water level the observer is, the farther away he would be able to see a light.