A bright circle of light

I was sitting on my patio around 8:30 pm facing west, twilight. A large circle of very bright light passed over my house. If you hold your thumbs and index fingers together and make a circle and hold them up, that was about the size, pretty large. It was moving east to west fairly fast. The house behind me have some large trees. It only took about 3 seconds from when I saw it until it went behind the trees. I ran to the back of the yard to try and see through the trees and beyond. It was gone. This was a round circle of very bright light. It wasn't fire, but did seem to be high energy. This circle of light / energy did not emit light and there was no sound from it. I live about 20 miles from O'Hare airport. we have planes that circle Elgin and start there decent to land. The altitude of this wasn't treetop, but I believe well below the altitude of planes we see which will land at the airport. Again, this only lasted about three seconds, but was incredible. My wife told me not to tell anyone, but I can't forget this. I'd like to know if there was anyone else had seen this and reported it to anyone.
I'd like to stay anonymous other if someone would want to contact me.