Under ideal conditions, standing at sea level, with your eyes about 5.5 ft above the water, you can see an object on the water at about 3 miles. This is due to the curvature of the earth. If you were about 100 ft above the water, it jumps to 12 miles. The formula is Square Root(height above surface / 0.5736) = distance to horizon.
It depends on the ocean in question and the weather on the day you are viewing it.
Because the Earth's surface is curved. You can only see a few miles from a standing position.
Balboa was the first to see the Pacific Ocean while traveling across the Isthmus of Panama. He saw the ocean in 1513.
We see "trans" used to mean across in lots of applications. A transAtlantic flight is routed across the Atlantic ocean.
The trip was to see if he could go to eastern Asia by traveling west across the Atlantic Ocean.
The distance from Spain to morroco is approximately nine miles. You can see across it very easily.
2.9 miles
In the middle of the ocean a tsunami is a few inches to a few feet high and many miles long and takes minutes to pass. Such a gradual change would not be noticeable.
15 miles
Miles and miles are the same measurement. Therefore, he would be able to see 12 miles.
There's really no bridge in the ocean to the ocean bridge in Arizona, but there did used to be a bridge that stretched across the ocean to the other side of the world but the oceans rose up so you can't see it but there are pictures of the bridge.
The Area of a circle is Pi times Radius Squared. If you can see 12 miles in every direction, you see everything in a circle 24 miles across. The circle's radius is 12 miles (distance from the center to the edge). Multiply the radius by itself (square it) then multiply that by pi (3.14...) So, pi (3.14159...) times radius squared (12 x 12 = 144 ) = 452.3893421..., a little over 452 and a third square miles.
It depends. If you are referring to driving visible distance than your distance is at a maximum 2 miles on a flat distance. You can see protruding objects such as mountains, buildings, etc. from at the maximum of 2.5 miles but that is all. If you are on the ocean however you can see items taller than 2 miles high at the range of 5 miles. On flat land looking at flat land or protruding objects your maximum is 2.5 miles to answer your question.