I recently returned from a road trip that took in The Grand Tetons, Yellowstone, Seattle and the Cascade Mountains of Washington State. Whilst staying in Chelan I was lucky to see a spectacular Circumhorizon Arc just above the horizon directly below the sun. I photographed it (of course) and sent it to Les Cowley who runs the superb website Atmospheric Optics. He immediately let me know that it was a particularly good example and that he’d use it for a forthcoming “Optics Picture of the Day (OPOD)”. He posted it this afternoon, here are the links:
Webesite Home Page:
www.atoptics.co.uk/index.htm
OPOD - it’s here for the next few days:
www.atoptics.co.uk/opod.htm
Permanent location if you miss it as the OPOD during the next few days:
www.atoptics.co.uk/fza118.htm
It was spectacular - the first time I’ve ever seen one.
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