The time lapse movie shown here is made of 414 single pictures of 25s exposure time each and an interval of 30s. Sensor sensitivty was ISO 3200 and colour temperature 3200K. One can clearly see that the clouds are forming mostly on the same position when the air floats over the mountain summit and the vapour condensates. The bright lines crossing the sky are from airplanes. In the background there is Mirasteilas Observatory, Falera with the open roof which closes at the end of the movie. 74 pictures of this sequence are combined to a star trail movie. — Nikon D3, Nikkor AF-S 17-35mm 1:2.8D, 17mm f/2.8, ISO 3200, Falera/Grisons, 18 September 2009