You have to remember that the moon is outside the atmosphere, so you can't
really do this with a blue (infinite) sky_sphere.
I have achieved great results simulating the atmosphere with coloured fog or
media in a finite, spherical container. Now, the blackness of space and the
black (shadowed) part of the moon are not visible.
If the viewpoint & ground is now positioned in realistic proportion to the
atmosphere, you also get the natural darkening of the sky towards the zenith.
If you want, I can look around for an example scene.

Margus

John Bindas wrote:
> 
> The last few weeks, on my way to work, I noticed the Moon in the morning sky
> and it reminded me of a problem I had months ago doing a sci-fi scene. When
> you look up at the crescent Moon in daylight, you don't see the unlit part
> of the Moon. You just see the lit crescent in a blue sky. This effect is a
> common sci-fi art theme, an alien landscape with two moons and a Saturn-like
> planet in the sky.
>

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