Really cool Jim! I like how you pan and zoom in yours. It gives me something to look for on mine.
Have you noticed issues with YouTube serving up the SD version for the first 10 or 11 secs before the HD version finally loads and renders? My last timelapse with stars from Joshua Tree had that issue. I googled it, and it seems to be a pretty serious problem with YouTube and I couldn't find a fix. Have you seen it, or know how to prevent it? I would rather YouTube just say loading for 10 seconds while the HD version downloads to the browser for the viewer, then for the first 10 seconds to be so blotchy and pixelated. I haven't noticed that issue with any of your video's.