Presumably to observe the same time in both pieces of Michigan (for no useful purpose that I can see, just "politics")!Anybody know the reasoning for EST for the UP? I know if UP county touches Superior they are on ETS. To me makes no sense & entire UP should be on CST same as all of WI.
From Wikipedia: (click →) "Upper Peninsula of Michigan, Time Zones" (quoted here in part):
In 1967, when the Uniform Time Act came into effect, the Upper Peninsula went under year-round CST, with no daylight saving time. [!] In 1973, the majority of the peninsula switched to Eastern Time; only the four western border counties of Gogebic, Iron, Dickinson, and Menominee continue to observe Central Time.