Just before sunrise

This image was taken just before the crack of sunrise picture and shows the sunlight clouds above Kitt Peak. The McMath solar telescope and Spacewatch 1.8-meter dome are visible in the right third of the image. Near center on the horizon is the Santa Rita mountains featuring Mt. Hopkins where the MMT telescope is located. A pretty sunrise like this is an indication of a difficult night of observing with all these clouds about. This image was taken at 18mm focal length with an exposure of 1/200 seconds at f/8, ISO 400.