The distance at which lighthouses are visible at sea far exceed any possibility of a globe earth. We are using the curvature formula of 8 inches per mile squared
- Dunkirk Light (194 feet) in France is visible from 28 miles away, which should put the light at 190 feet below the horizon.
- Port Nicholson (420 feet) in New Zealand is visible from 35 miles away, which should put it at 220 fee below the horizon.
- Cordouan Lighthouse (207 feet) on the west coast of France and visible from 31 miles away, which should be 280 feet below the horizon
- Cape Bonavista Newfoundland (150 feet), and visible at 35 miles away, which should be 491 feet below the horizon
- Lighthouse Steep of St. Botolph Church (290 feet) in Boston, and visible from 40 miles away and should be 800 feet below the horizon.
I could list out hundreds of examples but that would be quite boring. But I promise you this ability to see further than you should can be demonstrated anywhere in the world. I plan to add other point of interest to this list over time.