For you scientific types out there here is a definition of Sun Dogs I found on Wikipedia:
sun dog or sundog (scientific name parhelion, plural parhelia, for "beside the sun") is a common bright circular spot on a solar halo. It is an atmospheric optical phenomenon primarily associated with the reflection or refraction of sunlight by small ice crystals making up cirrus or cirrostratus clouds. Often, two sun dogs can be seen (one on each side of the sun) simultaneously.
When sunlight passes through the sides of a flat crystal, both the angle of the sun rays and the orientation of the crystals affects the shape and colour of the sun dogs. Misaligned or wobbling crystals produce colourful and elongated sun dogs, while light passing through the crystal in non-optimal deviation angles (up to 50°) produces the "tail" of the sun dog stretching away from the sun. As refraction is dependent on wavelength, the sun dogs tend to have red inner edges while the colours farther from the sun tend to be more bluish-white as colours increasingly overlap
When sunlight passes through the sides of a flat crystal, both the angle of the sun rays and the orientation of the crystals affects the shape and colour of the sun dogs. Misaligned or wobbling crystals produce colourful and elongated sun dogs, while light passing through the crystal in non-optimal deviation angles (up to 50°) produces the "tail" of the sun dog stretching away from the sun. As refraction is dependent on wavelength, the sun dogs tend to have red inner edges while the colours farther from the sun tend to be more bluish-white as colours increasingly overlap
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