2 different horizons at night

Hi everybody!Recently, when I was flying at night in fs9, I realized that when I look around the plane it looks like this: on the one side, it's completely dark (this apperars to happen for some reason when it's night ;) ) BUT on the other side of the plane, there are two different horizons! The first one begins way too close to the aircraft's position, and the strange thing bout it is that IT LOOKS LIKE IT'S DAYTIME. The errorous horizon is like a thik layer and the second horizon, probably the actual one (cuz it's dark) starts where the other one ends.I bet y'all can imagine how much this bothers me.Does anyone know how to fix it?Thanks in advance for your help(I'm using Ge-Force 3, the worst one with 64 mb, 1.8 ghz P4, 512 mb sd ram)