Depends just as much or more on the time of year - sunrise/sunset varies a lot by season. I think it makes less sense to base things relative to sunrise when it's so incredibly varied.
I didn't make the claim that "two hours after sunrise" is completely accurate. I made the claim that it's more accurate. It's more accurate for more people who live relatively closer to the equator.
That's not really any better as solar time varies by season and latitude, and becomes totally meaningless at the extremes. "Two hours after sunrise" is a meaningless statement for about half of the year in the attic circle for instance.
> There are older people who go to bed at 19:00 right after their supper and are up by 5:00, and there are younger people who will be out partying all night, go to sleep at 5:00, and wake up at 12:00. Expecting everyone to abide by the same 9-5 schedule, even in the same current-day timezone, is social tyranny.
Humans are diurnal and "9-5" covers daytime (i.e., when people are active) at most latitudes during most seasons in most timezones. Businesses will center their schedules around this window no matter what it's called.
So the argument is that "getting up at 9:00" is equally worthless in such a situation for connoting waking up a little late. Especially in a place with no sunlight, where the hour when you get up is all the more arbitrary since you don't have the sun to provide a natural guide.
> Businesses will center their schedules around this window no matter what it's called.
The original point is that a business's customers are rarely all in the same time zone anymore. Abiding by UTC doesn't prevent them from opening mainly during the daytime, it just makes it easier to do business with people who live that much further away from you. The point about social tyranny is more a side benefit than the main argument.
If there are no timezones, I don't have the out of band knowledge of what standard business hours are, and I need to somehow figure this out for all parties. Abolishing timezones makes some computation tasks easier, at the expense of complicating actual human interactions.
Changes to "two hours after sunrise". Which is more accurate in a globalized world anyway, because 9:00 is sometimes an hour after sunrise and sometimes several hours after sunrise, depending on where you live.
> Mental sanity checks
If you're setting a remote meeting with someone several hours flight away, you will have access to their calendar. Their calendar will include their normal and extended business hours, and probably their typical sleep hours too.
There are older people who go to bed at 19:00 right after their supper and are up by 5:00, and there are younger people who will be out partying all night, go to sleep at 5:00, and wake up at 12:00. Expecting everyone to abide by the same 9-5 schedule, even in the same current-day timezone, is social tyranny.