Three circular lights in a perfectly formed triangular shape moved accross the sky at high speed before stopping and changing directionStanding in my front yard I looked at the sky wondering if I would see a shooting star when I looked up a moving object caught my eye. At first I thought it was a plane but as I observed I heard no sound just saw the three lights in a perfect triangular formation change direction and moving quickly accross the sky. The lights were dim but bright enough to watch as they disapeared over the horizon. I've seen satelites and this object wasn't one, it moved from just above the south western horizon to disapear over the north eastern horizon within 30sec. They were white in colour but quite dull. Just before it disapeared over the horizon the object came to a complete halt, remaining perfectly still for about 10-15 sec. My two dogs were locked up at the time, but when I let them out into the back yard they whimpered and barked at the sky. They have never done this previously.