Babylonians knew 7 planets and named each day of the week as ruled by a planet... It had also been subdivided into planetary hours... https://www.timeanddate.

Babylonians knew 7 planets and named each day of the week as ruled by a planet... It had also been subdivided into planetary hours... https://www.timeanddate.com/calendar/days/7-days-week.html https://www.timeanddate.com/calendar/days/7-days-week.html