Halos are rings of light that can encircle the sun or the moon, and they usually occur when a thin layer of cirrus clouds are present in the sky. Usually this means that there will be rainy days ahead.
Find more about halos here:
http://earthsky.org/space/what-makes-a-halo-around-the-moon
https://weather.com/news/news/sun-halos-florida-20140416
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