Illumination Source

These were actually bonus photos. I was traveling north of Alburnett Road about three miles north of Marion, Iowa on Monday, July 9, 2013 to get my camera closer to a towering cumulonimbus cloud that was high enough to be brilliantly illuminated by the setting sun while all else was in fading light. The source of that illumination turned out to be spectacular as well. The top image shows the setting sun at 8:29 PM, about 1.7-mile south of County Home Road. The bottom image shows the scene from two miles further north at 8:34 PM from the Pioneer Marion Research Center. The cumulonimbus cloud was in the northeast sky. Sunset was at 8:43 PM.