Triangle-shaped formation of 5-6 bright white circular objects that flew slowly from North to South with steady light and no noise

On a Saturday night, when I was in high school I was watching television at around midnight when my mother came to the living room because she heard a car stopped outside of our home.  When we walked outside to see why the car had stopped, we observed that the occupants of the station wagon (4 adults) were looking up to the sky.  When we turned our attention to the sky, we observed 5-6 bright white circular objects flying in a formation in the night sky from North to South.  These objects, which travelled at a slow pace, made no noise and left no trails while they flew overhead.  These objects flew at about a distance of 1000 to 1500 feet above the ground.  As I remember, the objcts flew in a triangular formation but did not stay in this formation.  The objects criss-crossed each other, changing positions in the formation, in a way that I would not think to be possible from any type of aircraft that I know of.  We all stood there and watched these objects until they disappeared over the tree filled-horizon toward Route 17 and SUNY Binghamton.  My mother called the State Police and they commented that they had several calls about these objects but the police did not know what they were.  We watched the local news and looked in the local newspaper for several days following the incident and found no inforamtion describing this event.