Here is the time-lapse movie I took last Saturday night, August 20, on a perfect night at Bow Lake in Banff, Alberta.

The sequence starts in bright twilight then darkens to full night with the Milky Way over the  mountain silhouettes. The peaks then light up as they catch the light of the rising last quarter Moon coming up about 11:30 pm in the east. The moonlight creeps down the mountains to light up the entire valley and the lake. The sky brightens to deep blue again. The sequence ends about 3:30 am.

There was hardly a cloud in the sky all night, unusual for locations near the large icefields that straddle the continental divide.

I assembled the movie from 454 frames, each 40 seconds in exposure time, and taken 1 second apart.

— Alan, August 24, 2011 / Movie © 2011 Alan Dyer