Human beings have always gazed with wonder at the world around us. Whatever people in the past saw was their reality. What we see now is ours.

The best instrument ancient humans had was their eyes. They lived in a flat world, a world probably no larger than a hundred miles in any direction. Most would never travel to those borders, and anything beyond that was in the realm of the unknown and unknowable.

Above them were lights. A large light by day and thousands of smaller ones by night. They watched these lights carefully. They were obviously embedded in some sort of dome that covered the earth. The patterns of movement they saw in the night sky were