TheWeatherNetwork.com says that maximum visibility is about 7 miles before the horizon “falls away.”
The furthest the human eye can see out to sea on a clear day is 25 miles due to the curvature of the earth. After this length, the sea disappears into a flat line, or so it appears to the bare human eye.
Distance to horizon (miles) = sqrt [ 7 × h (feet) / 4 ].
h – Height of the eye
This is a handy equation to approximate how far you theoretically should be able to see on a clear day. However, how far you can see will depend on several visibility factors, such as fog and cloud cover.
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