> The Jewish day of rest — the Sabbath — falls on every seventh day. With an added blank day inserted each December, the Jewish seven-day cycle (believed to be dictated by God) would no longer align with the days of the week. The Sabbath — a day on which work is prohibited for Jews — would land on a different day of the week (and not necessarily on a weekend) each year.

So did mankind keep the universal 7 day week (as god intended it) and in doing so, inadvertently prove it to be a man-made construct?