1. Trailblazer

    Contrails versus humidity: a timelapse project

    This is something I've been meaning to do for a while: a daily record of the contrails (or lack of contrails) in the sky, in a known location, compared to a daily record of the atmospheric conditions in that location, specifically the relative humidity at typical aircraft cruising height. I'm...
  2. Mick West

    Time Lapse Videos of the Sky (that you took yourself)

    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...