I observed a dark green, disk shaped object, with a bead of light around it, which I could not give a rational explanation to.As I was driving home in the country, 28 July 2002, at about 11.38pm, I noticed what appeared to be a small, dark green, disk looking object with a thin bead of light around the edge. It was at an angle of about 45 degrees in the sky and some distance away. It appeared stationary for a few seconds and then descended quickly at a slight angle to vertical. My view was then obscured by trees and large hedgerows, so I could see it no more. I arrived at a more open area of countryside, a few moments later, but there was nothing to see.There was a yellowy moon out. Unfortunately, I was by myself; returning home from working late at the office. I am an accountant, 55 years of age. That's exactly what I saw and I couldn't put a rational explanation to it. It wasn't a meteorite and I'm sure it wasn't any sort of aircraft.