This thread is for sharing your own time-lapse videos of the sky. Please don't post it unless it's a video you took yourself, or your have permission to share it. If possible, please give the time and place, and identify any aircraft. I'd like to build a collection that illustrates some of the more misunderstood factors in contrail formation and persistence - particularly how trails are laid down parallel, how gaps can form after the trail forms, and how the atmosphere is layered, with each layer doing things independently. This was taken in Shingle Springs, Northern California. Feb 2nd 2015, and illustrates the clouds moving in two different directions in different layers.