Pictured Rare upside-down rainbow spotted in the UK

It appeared in the sky for the briefest of moments. A dazzling arc of psychedelic colour reminiscent of the Cheshire Cat's grin in Lewis Carroll's Alice in Wonderland. But this is no fantasy or trick of the light, it is known as a circumzenithal arc. Seen here shimmering in the sky over Cambridge in the afternoon sunshine, it is often mistaken fo