I don't know how things work in oriental climes, where weeks are a recent innovation (I think), but in the Eurasian landmass West of Persia (roughly speaking) we have been stuck with the Sumerian (or thereabouts) system pretty universally (Judaism excepted since they don't like mentioning Marduk and Astarte and the like). So, Sun, Moon, Mars (in some guise, but mainly the planet), Mercury (planet, speedy god, messenger, etc.), Jupiter (planet, top god, thunderer, etc.), Venus (planet, love beauty, etc.), Saturn (geezer god, slow planet). The god-to-god mappings are too confusing to mess with here, especially if you take the Eastern versions into account. The planet mappings are muddled at best. And if you throw in some astrology or other, things get out of hand. I know that numbers are boring, but at least they make immediately clear sense, unlike any other system (probably even to the Sumerians). The same goes (maybe double) for the months (although the whole concept of a month is a total muddle from the get-go). In fact, Earth time is a hopeless jumble into which we can insert very little in the way of order, but that is not areason for repeating -- or increasing -- traditional confusion.