[samatman]

I'm not sure why lengthening the months got folded in with lengthening the week.

Months and weeks are completely independent, we could have an eight-day week and keep months precisely as they are now.

I think it's way too weird to actually do it, but it's less weird than having a cycle of months that's longer than a year.

Islam manages, somehow, to have a cycle of months that's substantially shorter than a year, and doesn't throw in an extra month from time to time like Jews do. I've always found that exceedingly strange, but I guess you get used to it.