What you’re looking at is not an upside-down rainbow or a clever trick from the photographer. This extremely rare phenomenon was caused by sunlight shining through a thin, invisible screen of tiny ice crystals high in the sky. Andrew G. Saffas, a Concord artist and photographer, saw the colorful arc at 3:51 p.m. on January 13th while having a family party. It lasted an hour, long enough for him to grab his camera and shoot many pictures, before it disappeared. This is one of the shots he took.

Source: The San Francisco Chronicle