Circle of lights which then spun around and dissapeared.Groton, CT 06340 7:23 P.M.Saw a semi circle of bright lights hovering in the distance. Vantage point was standing on our back porch looking towards Long Island Sound with no city or residences between us and the ocean. The object hovered for 3 minutes. It then appeared to come closer to the house. Then it spun around or did some sort of acrobatics and disappeared. After this we waited for an hour and it didn’t come back.