BB:  Were the photo the effect I was looking for, it would be very good indeed, however I'm not looking for how a camera could make things seen, but how an eyeball would.  No shader problems, and trying many different values of GC to see what works.

Kawecki:  Light source behind the camera, rising full moon before the end of astronomical twilight.  Skies could be just a gray background, during that period one might see Jupiter or maybe Sirius, if anything.  Lighting the scene with the moon visible in the background, not something I want to do, enough problems doing it the other way.  No trees for this one, but buildings, and they're in the distance a little, far enough that most detail should be muted or not seen.

Been playing with this for a lot longer than I want to admit, without getting the effect I want. 

D.

The "I" in Doric is Silent.