In the international standard ISO 8601, Monday is treated as the first day of the week, but in many countries it’s counted as the second day of the week.
I say again, which day is the seventh depends entirely on which day you started counting.
[goofy tangential sarcasm]
I prefer to count the days in descending order of apparent brightness of their celestial namesakes:
1- Sunday (Sun)
2- Monday (Moon)
3- Friday (Venus)
4- Thursday (Jupiter)
5- Saturday (Saturn)
6- Tuesday (Mars)
7- Wednesday (Mercury)
While the non-consecutive ordering is very weird, it has a certain originalist appeal that I imagine made sense to early people who spend more time watching the sky. And that’s why Wednesday is the Sabbath.
So, seeing as the corporate body is working Sunday even if they do robots on Friday night and Sunday (or have people in a timezone that isn’t Sunday in Zion attend to robots serving 9993 orders of shrimp paste) they merely have to have the corporation put to death on US Attorney General Time, then survive it.
Sorry that can’t be the right spirit of it, can it? I mean what if a contractor has to plunge the mayonator? Trick stoning pit on the green roof? Death chits from CFA? Zealander-Turks flag walkarounds? But of course a Chapter 11 payday for the courts? Better illume a celestial weekday observance (on…the Contractor’s side?) Can no one be counted on to fail to care anymore?
Of course, if you go back far enough, then Sunday was a day of rest (read: a day where everyone goes to church, and the womenfolk still do all the cooking and cleaning), and Friday was a lenten day where you couldn’t eat meat.
But people forget that Wednesday was also a fasting day.
Indeed, it’s baked into the modern Irish words for the days of the week:
Sunday: Domhnach (Lord’s Day, from Latin)
Monday: Luan (Brightness or Moon, from Archaic Irish)
Tuesday: Máirt (Mars’ Day, from Latin)
and Saturday: Satharn (Saturn’s Day, again from Latin) are all straightforward.
But Wednesday, Thursday, and Friday are illuminating:
Wednesday: Céadaoin < Céad Aoine “First Fast”
Thursday: Déardaoin < Dé idir dhá aoine “Day between two fasts”
Friday: Aoine “A fast”
So clearly, Friday was the lenten day, which needed no disambiguation. Wednesday was the other lenten day, and Thursday was just the day between those two.
That might go some way to explaining why a half day on Wednesday used to be a thing. Or it might just be a coincidence.
But this wasn’t a regular 7 day cycle, because the moon cycle is between 29 and 30 days. From the 28th day of one cycle to the 7th day of the next cycle isn’t 7 days. It’s 8 days or 9 days depending on where the rounding falls.