This is off topic, but I thought some of you might find it interesting. I was fishing from a boat one night, on a calm lake. We had a lantern sitting near the water, on the six foot of beach the lake had. We were close to two miles away from the lantern. My brother leaned over to pick up something he dropped. He told me to look at the lantern and lean over. When I did I the light disappeared. The light was being blocked by the curve of the Earth.