A dozen or more lights in a "V" formation moving quickly and silently.I was taking my dog out, and while I waited for him I was looking at the night sky. It was clear at the moment and as I looked at the stars directly overhead I saw a "V" shaped formation of approximatly 12 to 15 lights traveling northwest. They were traveling very quickly, and silently, and in a few seconds were out of sight. The individual lights though staying in formation seemed to flit around. It made me think of a group of clear spheres flying in formation with a single firefly darting around in each one; if you can imagine that.