A sundog is an atmospheric optical phenomenon that consists of a bright spot to one or both sides of the sun, usually in a 22-degree halo. They are caused by the refraction of sunlight by ice crystals in the atmosphere.
At minus 30 degrees Celsius on this winter morning in the Canadian Rockies, a beautiful and bright specimen glows through the heavy trees after an overnight snowfall. It was a treat to watch the ice crystals glitter and sparkle as they floated through the crisp morning air.
