مفت ویڈیو Compilation of Noctilucent Clouds at 2014 July دیکھیں

You see timelapse animations.
The images were made with 2s and 5s interval.
Sometimes the full frame was downscaled and sometimes you see a 1:1 pixel copy of the frame.
Due to automatic exposure in some intervals there is unfortunately a "flash" effect in some timelapses.