For one, the human eye can't see past 5 miles so how are you going to see 63 miles ? I worked on the water when I was a child, the Island I lived on had two huge trees at the South end of the Island. These were our land markers when traveling out into the Bay. If you travel 5 miles, the trees would go below the water line surface of the water. As you traveled closer, they would arise above the water level surface. The only way this can happen is if the Earth is Round. Keep in mind, you can only see for 5 miles.