Single white ball streaking downward for 10 seconds. Sudden disappearance.There is a large picture window behind the television set in the living room. It was dark outside and about 22:10, my attention was diverted from the TV because of a white light in the sky which was streaking downward from right to left as I was looking north east. It looked like a falling white flare and had a short white trail. The light was quite intense and suddenly disappeared just above the tree line. There was no smoke. I believe the light went out before it was out of view from my seat.I was vaguely aware of the light for a second or two before remarking about it to my wife. She was sitting in the room to the side of me and didn't have the same view of outside that I did. She did not hear or see anything unusual.I immediately went out side and could hear no unusual noise and could see no unusual lights or other scenery. There were no subsequent police or rescue sirens.I am an alert active 73 year old retired Neurologist. I have never had a previous sighting of any unusual sky events. I'm not subject to hallucinations and have not had any retinal problems. I did serve in Vietnam and the light I saw tonight resembled the illumination flares used in night combat, although they lasted much longer.