This is backwards. In the age of pervasive digital assistants, there is no reason not to have two dimensional time zones (perhaps state level) where seven a.m. is sunrise every single day. That’s how humans evolved. To rise with the sun. Waking up with the sun in a different spot in the sky every day is disruptive to sleep cycles. This can be accomplished by skewing the time every day at 3 am for a few dozen seconds. Zoom can take care of aligning video conferences to UTC slots.
If you wish to rise with the sun, then that is what you should do, rather than relying on clocks so much.
Clocks are useful to measure the time, not to wake up and sleep and do other stuff.
Abolishing daylight saving time would be better, and then use time zones based on mean solar time for local time keeping, and UTC for any other kind of time keeping.
What you proposed seems to be a clock based on the sunrise time (similar than Babylonian hours), using that to decide when to wake up.
What I proposed is that the time shown on the clock shouldn't affect your waking up, sleeping, etc, and for local time to be based on mean solar time according to noon/midnight, rather than sunrise.
“A few dozen seconds” is more like 120 or even 180 per day at more distant latitudes. And then there’s the whole “the sun doesn’t rise for a long time” at extreme latitudes. So that would be pretty comical when 7:00 just doesn’t happen. Do we stop the clocks?
A few minutes per day is well within the natural variance of human sleep.
Proper circadian functioning is even more important in extreme or alien environments. Solar time won’t work on the dark side of the moon, either. Likely the solution here is a completely artificial cycle based on indoor lighting, as exists on submarines. There will be some kind of time zone divorced from the sun in any scheme chosen here. Solar time works best where when the sun works.
