May 27, 2013
The universe does not repeat itself. Every sunrise is unique, every snowflake singular, and every birthday yours alone.
Bird Sun Dog
Birthday · May 27, 2013
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APOD published May 27, 2013. Credit: Juan Manuel P�rez Rayego. A publication-date match, not a photo taken on your date. Independent of NASA.
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 hexagonal 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. Sundogs 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 M�rida, Spain.
Image credit: Juan Manuel P�rez Rayego