Rainbows on the ground. Judy Mosby took this on May 28 '08 at Fernley Sink, NE of Fernley, Nevada. ©Judy Mosby, shown with permission. Rain sweeps across the Nevada desert and a primary rainbow (red on the outside) is only just above the horizon. A fainter secondary bow (red on inside) hangs low over it. Both bows are centered on the point directly opposite the sun and the higher the sun the lower are the bows. At sunrise and sunset the sun and bow centers are both on the horizon.