What a nice way to start the day. Can you tell if this is sunrise or sunset? "The first is in our heads. "At sunset, our eyes are daylight adapted and may even be a bit weary from the day's toil. As the light fades, we cannot adapt as fast as the sky darkens. Some hues may be lost or perceived in a manner peculiar to sunset. At sunrise, however, the night's darkness has left us with very acute night vision and every faint, minor change in the sky's color is evident. In short, you may perceive more colors at dawn than at dusk. Human activities also drive a divergence between them. At sunset the sky is full of pollutants and wind-borne particles. During the night, winds die down, smog-producing urban activity eases and the atmosphere cleanses itself. The dawn is clearer than any other time of day." -David Lynch and William Livingston (atmospheric physicists)