Atmospheric Optical Effects, Snow Sundogs at Calgary, Alberta, Canada April 29, 2018 WPOTD Editor Leave a comment A cold winter day in Calgary, Alberta, Canada on Jan 11, 2018, about -25C. I put the sun behind a tree to get a nice exposure of the circle and the bright sundogs. Photo Credit: Tim Free Click for larger image. Share this:EmailFacebookRedditTwitterPinterestLike this:Like Loading... Related