The Roman Astrological Week

The sabbath cycle is one of the main influences on the emergence of a seven day week. But another major influence seems to be the roman planetary week. This is having seven days that are named after the planets, or gods associated with the planets in the astrological system. It's not like there's anything physical you can say that associates the sun with sundays or the moon with mondays. It's just they just happened to pair them that way.