Brazilian Halos - imaged by Caio Moreira van Deursen at Boissucanga beach in S�o Sebasti�o - S�o Paulo. ©Caio Moreira van Deursen, shown with permission.

At far left a sundog or parhelion. A 22 degree halo encircles the sun and is topped by a diffuse upper tangent arc.
Atmospheric
Optics

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