I recently was able to view a 193 foot building from 24 miles away. The base of the building is approximately 15 feet above sea level and my eye level was approximately 9 feet above sea level. I was viewing the building across a Lake. I could see a substantial amount of the building, which seemed like 75% or even 100%, but of course the distance was so great that I couldn't get details. Based on my curvature of the earth calculations, I should not have been able to see any of the building as ~270 feet should have been obscured by the curvature of Earth. What am I missing? Is there some kind of refraction?