For anyone who likes to fly at twilight or in the night, the following two enhancement tools shouldn’t be missed. 
The HD Moon Texture by Marco Fischbach can replace the default FSX moon texture (64×64) with one of its higher resolution moon texture sets — 2048×2048, 1024×1024 and 512×512.
My recommended choice is the 1024×1024 set, which is good enough to render a pretty and realistic lunar terrain effect, without sacrificing FSX performance.
The latest version 3 can be downloaded from FlightSim.com here.
FS Times 