As someone interested in the nocturne genre, I always find myself coming back to this post by James Gurney: Is Moonlight Blue?

http://gurneyjourney.blogspot.com/2008/01/is-moonlight-blue.html

It's really interesting to delve into the scientific study of night-time lighting and it's effect on color. Apparently, moonlight has a slight reddish hue; who knew?