Do other cultures which developed unconnected to the West/Middle East have seven day weeks? Do they have weeks at all? What is the variety? Do calendars exist in nomadic peoples, outside of the obvious seasons and solstices and equinoxes? Do they vary tribe to tribe?
I don’t know the answer. 7 is of course not a foregone conclusion. It informs Judaism, Christianity, and Islam for obvious reasons, and the cultures each of these cultures conquered in various ways, both peaceful and violent, but I was wondering in particular about sub-Saharan Africa, and the pre-invasion Americas.
I did some basic searches, but a superficial pass didn’t yield anything of interest.