Do Oceans Curve?

3 miles
For a six-foot (182.88 centimeters) tall person, the horizon is a little more than 3 miles (5 kilometers) away. Geometry tells us that the distance of the horizon – i.e. the farthest point the eye can see before Earth curves out beneath our view – depends simply on the height of the observer.Sep 12, 2012
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How far away is the horizon? - Live Science