Sometimes called a “mock sun,” Sun Dogs are a notable atmospheric optical phenomenon. They consist of a big bright spot in the middle (the sun itself) then on either one or both sides, you’ll see bright spots too. If there are two sun dogs, they’ll typically flank the Sun roughly within a 22-degree halo. Sun dogs are part of a specific family of halos that are caused by a refraction of sunlight by ice crystals in the atmosphere. The coolest part is that sun dogs are not just found in one region of the planet. You can see them anywhere during any season. Of course, sometimes they will not be as obvious as one of our mind-blowing science photos above that displays twin sun dogs.