Star Timelapse and long exposure night photographers get annoyed by all the current debris, they need to clean up their photos from the light streaks. On the ot

Star Timelapse and long exposure night photographers get annoyed by all the current debris, they need to clean up their photos from the light streaks. On the other hand, I remember reading about this town in the mountains that wanted to build a giant mirror on top of a mountain, so that they could prolong daylight in their valley.