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Sundog As seen from Barger on Jan. 5, 2017. Photo by Martin Granica

Martin Granica sent in this photo of a "sundog" seen from Barger on Thursday, January 5th. "The sundog on the left is really a very bright rainbow, you can see the foggy ice crystals between it and the sun. It was too bright for the camera to be able to capture the violet end of the rainbow but still looks cool." Sundogs form when sunlight passes through hexagonal, plate-shaped ice crystals in cirrus clouds, which act like a prism and refract light, according to a NASA release. They are also known as parhelia, and can be seen anywhere in the world, but are most visible when the sun is low in the sky.