White light varying in intensity at going bright then dim across sky, then changeing to white, red, and blue in rapid succession appeaI was working at the gas station, I went out for a cigarette it was 7:30pm. I was Faceing west, I happend to look around at the night sky. A light straight ahead of me at about 30 degrees (it was small about half the size of a pencil erassor if you hold it in front of you) I am guessing it was pretty far away. It was white but got bright and then went dim to the point of not seeing it in the sky and then got bright again. about 2 to 3 seconds in between dark and bright. i watched it move south for about 2 minutes. I also asked a man who was filling up his truck if he was seeing what i was seeing. his response was " Hmm that is a weird looking plane isn't it". I then had to wait on 2 costomers and went outside around 7:43pm and looked in the area i had last seen it. the light seemed to have gotten smaller and was flashing from white to red and then blue extremely fast. It stayed in the same spot for about 5 mins I had called my mother (she lives close to where i work) then I went outside and waited for my mom. Itstarted to moved north in the same degree and path that the White light moved except in the oppisite direction. my mom had arrived and looked at it and she thought it was a slow moveing plane.