Sky Circles

While driving down the road the other day I, not surprisingly, looked up in the sky

And saw some circles.

Like the circle in the Yet Another Lunar Halo post, these circles are the result of water in the atmosphere, in this case contrails. Contrails of planes likely circling the Philadelphia airport.

This second image shows a pale Sundog, the bright spot in the upper center, to the right of the overexposed Sun. And the bright spot on the contrail circle, below the Sundog, is a fragment of the 22° Halo, the type of halo shown around the Moon.