at midnight saturday/sunday 9/23/12 i was letting my dog out for the last time before going to bed.about 5 min. later iwent to the door to let her back in & thats when i noticed these lights floating in the sky. at first i thought they might be chinese lanterns but ruled that out because of the deliberate pattern. they all were going at the same rate of speed. this was over chicago & if they were chinese lanterns they would have been blowing all over. I estimated there must have been 15 to 20 of these objects & from where i stood they were say 30 to 40 degrees above the horizon. so after standing there staring i called my wife out to see these objects. we both walked out into the yard where we watched them for 5 min. or so. they seemed to be moving in a nw to se direction. not very fast or very slow, just an even speed except a couple of them sped up to catch up & get next to each other near the front of the line.we stayed outside watching them until they either winked out or just turned over lake michigan. they had a yellow/orangish glow & it was very hard to tell how far away they were. thats about all my wife &i can recall.