The lights of Banff light up the park’s sky of the same namesake at night, yellow street lighting bright and pollutive of the night’s clarity. They add a yellowing to the stratus clouds of the cold night sky, and the stars do not penetrate the light; this is an exemplar clip of what night pollution does. A moonlit night may have shown the shapes of the clouds in a natural light. Cars are seen traveling in streaks and the mountains are partially lit up by the city lights, as they have since the time the town has swelled as a popular ski resort town. Time-lapse length (30 fps): 21 seconds and 20 frames.