Brilliant dime sized objects rotating in a circle

about 21:00 hrs I was in my upstairs bedroom and happened to look out the window which faced east.I saw 5 brilliant white dime sized lights in the sky about 60 degrees above the horizon. They were arranged in a circle and the group was slowly rotating. At random intervals they would break away and reunite and continue the rotation. I called my mother and sisters to come and see them too, which they did.
The entire episode lasted about 15 minutes. Some time later my father came home from work and told us we would not beleive what he just saw. We told we would.
Date is approximate.  Lights probably were not advertising lights, given the date of the sighting, we believe.  PD