Fabulous rainbow at 4:30 in Santa Rosa today. It appeared in the east as a bank of charcoal rainclouds moved past the sun on the opposite side of the sky and let orange shafts of late-afternoon sunlight beam through the rain. Perhaps the best rainbow I've ever seen outside of Hawaii. A full half circle, deeply colored, with a distinct secondary rainbow above it, also complete. Not long ago, a friend pointed out to me that the order of the colors is always reversed in the secondary bow. Sure enough, the green was on the inside of the main semicircle of color but on the outside of the second one. I can't remember the physics of the phenomenon. It's Google time....
Which yielded this very interesting link: Atmospheric optics
Unfortunately, my hastily snapped photo captures only the main rainbow.
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