Bright light has been in the sky for 2 months, noticed it moved position, then it took off.My sister and I were standing out on our porch smoking a cigarette. We had noticed a really bright light in the sky for the last few months, but tonight it had moved lower down on the horizon. I pointed it out to my sister and we began discussing how that could be possible. I said that it couldn't be a star, because the axis of the earth doesn't move fast enough to change our viewpoint on stars overnight. As we were talking about this, the object moved sideways very quickly in the sky, and the light started dimming, until it looked as if it were trying to mimic a star. We kept looking at it and were in disbelief, when suddenly the light went completely off, leaving only a faint reddish-blue point in the sky. The reddish-blue "craft" started moving very rapidly in short movements diagonally and vertically, and then vanished from sight completely.I am 20 years old, and my sister is 17, and we were completely sober at the time of this happening.