About a half-hour before sunset I saw part of a rainbow extending upwards from the horizon about 10 degrees. All seven colors from red to violet were visible from left to right, but they were somewhat faded out. What caused this partial rainbow which I saw about 30 degrees north of the setting sun? As the sun set, the rainbow gradually faded out completely. The setting sun itself was quite a sight also. Unfortunately I am not a photographer. I do not even know how to take a picture with my cell phone. A red-golden sun started out about ten degrees above the horizon. Above was a dark gray cloud bank extending from abut 60 degrees south of the sun to about 20 degrees north of the sun. Below the dark clouds were lines of thin golden clouds extending out radially from the direction of the sun.