What caught my eye here was that the moon appeared to be sitting on a column of light.
Normally I would have expected a wider wedge or just a general brightness along that part of the horizon.
There was no sign of cirrus and the air was dry so it appears to just be down to scattering.
The image shows the column as slightly broader than it appeared to the eye so light levels probably also played a part.
As the sky darkened the wedge shape became broader and the glare round the moon started to dominate.
It wasn't a hazy evening but the longer exposure shows typical lower level scattering, the horizon is some 20km away.
Canon EOS 20D 3rd March 2007