Yesterday when I was running in Hopkins Forest, I happened to look at the sky just at the moment when a most amazing thing happened: A small cloud near the sun was colored like a rainbow! I happened to have my camera along, and snapped this picture (the color was much better in real life):

(click for 1024 x 768 version)

When I made a similar post on a WSO blog, Jono Dowse ’06 informed me that what I had seen was a sun dog, which occurs when the sun reflects off of ice crystals that are exactly 22° to the left or right of the sun, and at the same elevation.

For me, this sun dog lasted only seconds; the wind soon blew the cloud apart, so it was a very ephemeral rainbow.

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