On the evening of the observation I was standing in my front yard smoking a cigarette. When all of a sudden I noticed this huge object to my left and the star light and lights from the city were being obscured. It seemed to be just over the roof tops across the street from me. I could only see it's out line which seemed to be a V shape. As wide as a city block. I looked around for someone else to see this but it too late at night. It was going quite slow but I could hear the air passing over it. It was so large that it probably took a couple minutes to completely pass me. I could hear a low hum almost like a star cruiser on star wars. I know that sounds weird but that's the only way to describe it. At the last moment when it finally passed me a large hatch on the under side or on the right side appeared. I could only see it for maybe ten seconds. It was rectangular like a door but huge. Maybe as big as a semi in size. No lights at all. Just a massively huge size. No windows or antennas were visible. This was a very dark cloudless night. Very still barely a breeze at all. I only mentioned this to a couple people and they just kind of shrugged it off. So I never talk about it. I don't know how to enter sketches on the computer but I can provide them by mail if needed... sorry.