White flying saucer snapped over Dayton, Nevada

On July 17, 2014, over Dayton (Nevada), a witness has sighted, during several hours, a white flying saucer. During this time, object was stationary. What is it?

Witness statement:

At about Ten O'clock AM PST I was in the back yard smoking, when I heard a plane. Nothing strange about that, but as I was looking for the plain, I noticed a bright white "object" in the sky. I went and grabbed a pair of binoculars and I could see it was clearly a circular something way up in the sky. I grabbed my telescope and zoomed in with a K25mm lense and an 8 inch telescope. It was totally stationary for about 7 hours. I have a video on YouTube under the username Grimvolf. I also have several photos saved, many were lost to unknown reasons. My wife got home from work at just before Four O'clock and saw the object as soon as she got out of the car. It remained in the exact same position until cloud cover came along at about Five O'clock PM. From that point I don't know if it was still there, but it was there for me for seven hours that I am aware of! It may have been there only a matter of minutes before I noticed it, or days, I have no clue. But it was amazing nonetheless!