Star Trails at the Farm

My son Graham, who is a photography student at Brooks Institute, took this photo on our farm in January. It's our windmill (a restored Woodmanse) with star trails swirling around it. He was outside in the bitter cold after midnight for 40 minutes in order to get this shot (he didn't want to leave the camera and tripod set up and alone in the farm yard because he thought the horses would come over in curiosity and knock it over.)