Bird Sun Dog

Astronomy Picture of the Day · 2013-05-27 · NASA (public domain)

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Bird Sun Dog — APOD for 2013-05-27

Have you ever seen a little rainbow off to the side of the Sun? Rare but rewarding to see, such spectacles are known as sundogs, mock suns or parhelia. Sundogs are just sunlight refracting through hexagon al falling ice crystals in the Earth's atmosphere. When thin ice crystals flitter down nearly horizontally, they best refract sunlight sideways and create sundogs . Alternatively, randomly oriented ice crystals may create a complete circular sun halo . Sundog s occur 22 degrees to each side of a setting or rising Sun, although sometimes nearby clouds can block one or both. The above image was taken through a polarizing filter during October 2012 in Mrida , Spain .

Astronomy Picture of the Day for 2013-05-27 — image & explanation courtesy of NASA (public domain), mirrored at Tukuk-OS for reading and search convenience.

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