Star Trails around Polaris from New Mexico Skies

I took these 16 photographs (about 15 minutes each) during a somewhat windy January night. From inside the dome where I was taking deep-sky CCD images I swore that the camera tripod blew over a few times, but the images suggest steadiness. This is the first time I ever merged together a succession of photos like this showing movement over time. Prior to this I'd take a long single exposure, which would add horrendous light pollution and digital noise.