sundogs had formed on opposite sides of the sun (the right one is not visible behind a building to the right; the left one is the bright, washed out spot on the left), and a nice halo had started to develop.
|Unenhanced circumzenithal arc looking straight up.|
|Circumzenithal arc looking straight up, somewhat enhanced.|
|A view of just the circumzenithal arc.|
|A zoomed in view of the same arc, taken a moment later.|
|The halo around the sun continued to develop.|
|Halo mimics the shape of the tree.|
|Sundog to the left of the sun.|
The following day, I ran outside with my Brunton at about 4:50 pm to measure the sun angle, which was at 10 degrees above the horizon. The days are getting shorter by only 1 to 2 minutes each day, with minimal time difference in sunset between the two days in question, so the sun was probably at 10 degrees or slightly higher.
In fact, photos in which the ground isn't cropped out show that the height of the sun above the horizon is less than half of the 22 degree halo around the sun, although some distortion by the camera cannot be ruled out.
All photos except the one described as unenhanced, were enhanced by increasing color saturation and contrast, and by adjusting the brightness up or down as needed. They were then exported to a smaller size (1000px long dimension). After export, they were minimally sharpened to diminish blurriness imparted during export.
The first two photos both consist of two photos that were stitched together and cropped prior to enhancement, export, and sharpening. My semi-wide angle lens won't show a circumzenithal arc and the lower part of the sky in one shot.