A rainbow is a trick with lights and mirrors. The light comes from the radiant sun which must be in the west or the eastern part of the sky. The mirrors are a billion raindrops, falling from a dark cloud in the opposite side of the sky. You, the rainbow audience, stand with your back to the sun and facing the glimmering arch of colors looping over the opposite side of the sky.

The scants rays fall on the little mirrors. They act like glass prisms and split the sunbeams apart into various colors. The morning rainbow glimmers in the western sky and the evening rainbow shines in the west because the sunbeams must strike the raindrops at just the proper angles.