I've had another crack at this more or less following what grafikeer did, but something occured to me while I was toggling the settings. If I can line up the sun and the moon size - for some bizarre reason, even though the settings are the same, the sun is bigger than the moon - I can merge them together and utilise the light given off from the sun, but still getting the texture of the moon and some of the hue from that night scene.

I probably really don't need to do this, but just playing, this is what I got by merging the two together.