Sun dogs are called Parhelia, which means, "beside the sun". Parhelia are the bright spots 22 degrees on either side of the sun. They are formed when sunlight retracts through ice crystals suspended in the air.
|Parhelia on the left and right sides of the sun.|
Above the sun was the Circumzenithal Arc shown below.
|The Circumzenithal Arc visible above the sun.|
The Circumzenithal Arc is tangent to a 46 degree radius arc centered on the sun. Below is a close-up of the Circumzenithal Arc.
|The Circumzenithal Arc just touches and is tangent to the 46 degree halo surrounding the sun.|