UC Reader has a Startling SIghting in California

On August 6th at 3:03 AM, I heard a loud engine noise in the sky. It sounded like a plane was going down. As it got closer it sounded a little more like a helicopter. It passed almost directly over my house in Vallejo, heading west towards the ocean. I looked out my window and saw it for only a few seconds before it passed from my view, but I saw it very clearly in the bright moonlight. It was a large diamond or kite-shaped flat craft gliding swiftly (but much more slowly than a jet aircraft. It seemed more like it was "hovering" as it moved). If I had to guess I would say it was about the size of a commercial airplane, and I think it was maybe about a thousand feet up. On each corner of the bottom surface was a dim green round light. I am still just amazed by this. Because of the loud sound I’m inclined to think this was a human-controlled or military craft. However, those lights made it just seem so different from something military. I have tried looking for pictures of military aircraft online, and have seen nothing like this. I did see one aircraft with a similar shape, but it was smaller,and without the lights. Others have suggested to me that it could be a drone, and I guess that theory is more plausible than something supernatural, but still I am intrigued and mystified by this.

I have never seen anything like this in my life, and I am 49 years old. I have had times in my life when I have been obsessed with UFOs and have very much wanted to see one, but this is the first time to see any sort of craft! I am a big fan of Whitley and have read a number of his books.