Circle shaped, lights (different colors) around, dark gray color, very large size, humming sounds as slow passing. Another person w

Another person with me saw this. It was just a few feet above oak trees when I took a photo. However, the aircraft moved slowly to left from neighbor lights. You can see back lights.I got a good look but was struck with amazement watching it in open sky before thinking about a picture. Never seen anything like it. As a nurse with many years in critical care, I thought I had seen it all but this is top of list!!!