After the sun had set, I moved over a ways and caught the silhouette of the barely moving windmill in the remaining glow. There was hardly a breath of a breeze that evening.
Did you notice the combine going down the road in the photo above? Here's another photo, cropped so you can see it better:
The dust, from the road and from what the combines stirred up in the fields, just hung in the air, and I think that's what made for the brilliant glow of the sunset.
It was an incredibly beautiful and peaceful evening.