Sunday, November 30, 2008
We had rain here in Arizona on Wednesday. It was very refreshing. The air smelled wonderful afterwards and we were rewarded with a stunning rainbow at sunset. The main or primary rainbow was a complete arc, which I couldn't get in one photo, and had a secondary rainbow above it and a supernumerary rainbow on the inside. The sky is pink in the photo because of the sunset. Wikipedia gives a good explanation of how rainbows are formed as does Alex Filippenko in The Teaching Company series on Astronomy. It was interesting to me to learn that in the secondary rainbow, the colors go in the opposite direction from the primary rainbow (red to violet as opposed to violet to red), and that the supernumerary rainbow has pastel color bands. This one looks sort of magenta.