Two things to consider, how high above the water you are and how high above the water what you are looking at is. Say you are standing at the water, at 5 or 6 feet above the water, the horizon is about 3 miles. So you could in theory see a person’s whole body if they were standing at the same level. As theybget further away, you see less of them, until they are at about 6 miles, and you would only see the top of each other’s heads.
As you, or what you are looking at get higher above the water, the further away you can see them (think boats, buildings, etc.)
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