High altitude silver object visable 15 min hoovering slow sw trajectery early eve.The object was a silver ball that appeared to be of metalic substance as it reflected the sunlight as an aircraft would. The object first appeared as a faint star-like object over our condo's clubhouse in the east. It was very high altitude as I had jet aircraft as well as the moon in the sky at the same time to use as a guage as to its height. I estimate the object to have been at ten to fifteen miles high.I had to strain to keep the object in my field of vision as I was in the swimming pool and I normally wear glasses. I observed the object approxmately fifteen minutes and during this time of observation the ufo moved only very perceptbly about a 45 degree trijectory from due east, from where it appeared,to south southwest when I was no longer to perceive it with the naked eye at about 18:50 hours.I had originally thought it could be a satelite of some sort but it didn't have a satelite or a weather balloons flight charcteristics at all.The observer served in the U.S.Navy and the U.S.Coast Guard as a radarman and have had much experience observing all types of aircraft as well as weather balloons it was not either. I feel it was a fairly large contact to have stayed visable for the length of time it did at that height. Two other people nearby asked what I saw But did not come to see what I was looking at. IN my opinion it was a definite unknown.((NUFORC Note: We spoke with this witness via telephone, and he seemed to us to be quite credible, and quite sincere. We suspect he is an excellent witness. PD))