Daily Postcard: Sundogs appear in the sky Wednesday morning over White Rock. A sundog is a concentrated patch of sunlight that is occasionally seen to the right or left of the sun or even on both sides simultaneously. Also called mock suns or parhelia, meaning ‘with the sun’, according to the National Weather Service. Sundogs are part of a family of atmospheric optical illusions including moon haloes and the closely related sun haloes. All of these phenomena are caused by the refraction of sunlight by ice crystals in the atmosphere. Source: space.com. Photo by Steve Stringer