I was on board a flight to Richmond, VA and was looking out the window at the lights of the city as it grew darker and darker. We were about 10-12 minutes away from landing, and I noticed a strange series of 5-8 bright yellow/orange/white lights in a horizontal line that were hovering above some buildings in the city. They suddenly formed into a circle, and then continued to form in a straight vertical line. All at once, they shot straight up into the sky, leaving behind a jet trail. If I heard others correctly on that side of the plane (right side, same as me), they were asking "what was that?," "Did you see that?" so I'm pretty sure that I was not the only one. I felt nervous, especially sense I was on an airplane that was already turbulent. I tried to think of military tests, fireworks, airshows, etc, but I haven't been able to form a reasonable conclusion to what I saw tonight on the airplane.