Here’s one interesting video of a bright circle that was flying over Vero beach in Florida. This was seen and filmed on 8th September 2015.
Witness report: Bright star-like object moving at rapid speed with no sound
I woke up for work around six and went outside to take the dog out and smoke a cigarette. As I open the door I saw a bright star like object moving from the west towards me which was east then it took a slight northeastern flight path. To my naked eye it just look like a bright star but after viewing the video that I shot of it I realize that it was a doughnut shaped object.