Saw something strange in the sky last night (bad photo I know - upper band in this is the lower band, ignore cloud below) in Royal Oak MD, photo taken facing west. Went outside after dinner, probably a little after 8 pm and saw what looked like 2 contrails, one right above the other. Lower was more dense and above one lighter and taller (didn’t show up in photo). Then we noticed that they never moved/drifted. Went out to dock to a get a better view and saw that each kept its shape/density and seemed to curve like a halo from each edge of horizon. It finally all faded after about 2 hours. Any one have any ideas as to what this could have been?