Dear Mark,

After watching this many times, I finally saw the streaks.

If appears to be very fast if it is a plane.

Before I actually saw them, I was wondering if it was a reflection from someone's watch or other shiny object, as the sun was very bright that day.

What are those white streaks ?
 

Hi Dan: Yeah, exactly. If it's a plane, then it has to be a fighter jet or something which can go supersonic because I was using a relatively fast shutter speed in the hope I would get a crisp time lapse sequence without motion blur, since I was shooting a stationary object head on with only the Sun's ultra slow movement across its arc. WMV also clouds the issue by adding some video smooting. Even when you turn that off it's still on.