Have they fixed it so when you look at the System Map now, and zoom in on a planet, the surface settlements and ports are shown in the correct current hemisphere for day or night?
I think it's there so that you can study the colour of the the atmosphere. If you move it around so that the planet gets the light from behind you get an idea of how the atmosphere will look at the terminator. I suspect that they'd have to instance the entire system in parallel (if it's another star system) to be able to show you how the light would fall at any specific moment in time. Probably the reason it doesn't work as one would expect.