I used Stellarium to generate the realistic (but somewhat over exaggerated clarity) skies for my web game. The day/night cycle only shows stars at :50-00 of each hour: earth.suncapped.com.

I'll edit into this comment a link to the texture files if I can, but the game uses compressed (ktx I think) textures since the star textures are large resolution, one of the largest game assets!

I picked a particular date, time, and place on earth for rendering the sky in Stellarium. It also had options for seeing (clarity) and which features to show, such as planets or space debris.