Where in history is the starting point of modern week day count?

https://lemmy.world/post/2340523

Where in history is the starting point of modern week day count? - Lemmy.world

I mean, if today i.e. is Sunday then someone long time ago should have said “Today will be Sunday” for the first time in a period from today that is multiple of seven. I was assuming that it was Pope Gregory XIII in October 1582, but looks like he is not. I failed in googling and duckduckgoing out the answer, so I ask for Lemmy’s collective wisdom!

I believe most weekday names as we know them in English and many other northern European languages derive from the vikings.

  • Monday, not sure?
  • Tuesday = Tir’s day, Tir/Thyra being a woman in the Nordic mythology.
  • Wednesday = Wotan’s day, also “onsdag” in Nordic languages, Wotan=Odin.
  • Thursday = Thor’s day, also “torsdag” in Nordic languages.
  • Friday = “fredag”, from Frey/Freia in the Nordic mythology.
  • Saturday = lørdag, not sure.
  • Sunday = literally the day of the sun.
Saturday is Saturn’s Day