I have seen this sort of map make its way around from time to time and since I am a map nerd, you all get to see it too.
It shows the latest time in the morning that the sun would rise, if DST were made permanent.
I would hate to live in Western North Dakota on a good day, but having the sun rise at 10am would make it awful.
The sun rising at 930 in Detroit MI, Indianapolis IN, Toledo, IN, and Boise ID would be wild for the 8MM people that live in those metros. That could create huge change in economies, schooling, etc.
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