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© Department of Atmospheric Sciences,
University of Illinois at Urbana-Champaign
Used by permission
Halos are natural phenomena: they
are a ring of light in the sky.
Halos form when light coming from the moon or the sun is
refracted or
bent by
ice crystals present
in the atmosphere.
Halos are rare in this part of the world (Australia) but we experience refraction every day.