Found some dark sky tonight... just in time for the clouds to come in!
The soccer team had Saturday night off, and the school field was nice and dark. I setup to take 10 sec exposures - planning to shoot for about an hour. Ended up completely clouded over after 8 minutes! so my star trail circles became a short time lapse video. 8 minutes reduced to 2 seconds. At least I had a plane fly over right through the center of the frame. Sometimes you do get lucky!
Edited in lightroom. Converted to video in Quicktime pro.