The furthest point an individual can see when looking out to sea is called the horizon. For a 1.8m tall individual, that works out to be approximately 4.8km.
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assuming the wall and ground make a 90 degree angle with one another, Pythagorean's Theorem states the ladder will go 8 feet up the wall.
Using Pythagoras' theorem it is 30 feet
A better answer is to use the ocean that refers to sea level as a constant. Land cannot be considered. A telescope or binoculars would also be required. We are talking about the level of the earth dropping. Several buoys 6ft. in height set in the water at say 1/2 mile intervals, depending on the accuracy needed. A telescopic camera would be ideal This would be the best way to determine number of feet the earth drops from it's own curvature. Mr. Bill
1000 feet
If you are talking about finishing trim on half walls then most people opt for 42" or 48". If you mean finishing trim on a full wall that does not reach the ceiling then 1 foot below the ceiling is the usual. If you meant a decorative border then right below either of the other trims or at eye level.