Ocedian

http://forum.kerbalspaceprogram.com/threads/69907-0-24-Distant-Object-Enhancement-1-3-1-Planets-satellites-in-the-night-sky!-%287-29%29 does exactly what you want, as well as allowing you to render objects that are very far away like other spacecraft or planets. Though I'm not sure what you meant by the transition at daytime.