wow, all that over a typo
Obsessed much?
haha. No, I was calling him out on his claim that lighthouses can be seen 200 miles out at sea. That's a lie. Show me a lighthouse that's visible that far away with a telescope.
You’d need on the order of ~26,000 ft (about 5 miles up) for an object to be visible from 200 miles away to an observer near sea level.
Standard atmospheric refraction effectively makes Earth’s radius slightly larger, typically extending horizon distance by about 8%. That helps, but not enough to drastically change the result:
30,000 ft case:
~216 miles × 1.08 ≈ ~233 miles
So at 30,000 ft, a distant object could just barely be visible at 200 miles under ideal conditions, but anything significantly lower would still be hidden by Earth’s curvature.
I double checked these values in AutoCAD.
