There are some cities with light pollution ordinances where your lights have to be off by a certain time at night, and all streetlights and other outdoor lights are specially designed to minimize light pollution.
How about cars? They will still emit plenty of light. Also street lamps. It would be pretty dangerous to turn them off. I bet it would be the day of most commited crimes ever. Only turning off the buildings' lights probably isn't enough to see the galaxy, so I think it won't work, but it sure is a pretty thought.
Yeah we have that in australia, we call it earth hour, and everyone shuts off their lights for an hour to save energy or something. Australia- 1 Everyone else - 0
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