How to declare an objects x rotation

Okay So I have a sun and I had a script on it for when it rose at a certain time the intensity would change. However the skybox transition was way off so I want to simplify it so that I can just call an IF statement that states when the sun is at a certain rotation have the intensity change.

I want the sun's position to affect the intensity. so..

sun x.position = 270 intensity = 0 sun x.position = 235 - 0 intensity = .5

Anyone want to help me with this? Thanks!