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Time of the year’s earliest sunset
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You could overlay this map onto the enthusiasm for permanent DST and see a pretty good pattern. Those of us on the western edge of a time zone have a lot to lose in that scenario(9AM sunrises) where folks on the eastern edges would be worse off in a permanent ST plan (3pm sunsets).
Pretty much the real reason for the time change imo. If you pick a permanent time, there are winners and losers. So… we keep doing this dumb shit.
Folks on the eastern side of the time zones wouldn’t be any more worse off with permanent ST than we already are. We already use ST in the winter when the effective daylight hours are shortest. Permanent DT would be a quality of life improvement for eastern edge of timezone folks in the winter at the expense of late sunrises for western edge of timezone people. Permanent ST I think is at least better than the switching in that it doesn’t make the short day hours any worse and gets rid of the clock change silliness.
Having the sun rise at 4 am is pretty annoying though. That's what the permanent standard time does to eastern areas.