Pat, is this the prototype Google Push (c)?
Did you know that in many species including humans, along with a circadian rhythm or cycle there is a 7-day cycle (circaseptan rhythm), which seems to please the religious fundamentalists immensely, and is suggested by some as the real reason behind the 7-day week?
I thought the religious lot were more into the Summer soltice etc. Although recently the boffins seem to favour the Winter soltice for stone henge !
It is remarkable that even going back to the Babylonians, the 7-day week was established even within their primary sexagesimal system - which they inherited from the Sumerians. Across geographical, cultural and religious divides, the 7-day week is a constant. The only possible explanation can be Match of the Day.