a green circular light appeared and then darted behind the mountainsIt was just after dusk so it was pretty dark but no stars were out yet. I was just watching TV when I saw a flash and looked out the window. I had been looking for several seconds when I saw a circle shaped light out in the distance but fairly high in the sky. then it turned green and dove for the mountains where it disappeared. I kept watching the horizon but nothing else happened. It freaked me out because it reminded me of the footage I have seen of bombs in the middle east. thats why I had to report it.