"BlueLightning" wrote

Curvature of the Earth's atmosphere.
The atmosphere can bend light, like drops of water
There are other variables here as well, like the thickness of the air

The thicker the air, the more it's bent

Example:


Thanks for the info. I have been wondering about this for 20 years. I know
it wasn't really a weather question but I knew that there would be someone
here that had the answer.
Cheers!