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Summer Ice Halos imaged by Michael Beets, Corvalis, Oregon 20th June '08. ©Michael Beets, shown with permission.
The summer halos produced by ice crystals in high cirrus clouds show some arcs in less familiar guises. Here a diminutive parhelic circle is near the zenith. The halo around the sun is double, a circular 22° halo and a fainter, near circular, circumscribed halo. Below the sun is another sign of summer, a huge and colourful circumhorizon arc.

The labelled HaloSim ray tracing simulation shows the whole sky with the zenith at the centre.