How Time Is Measured

Just a thought…For hundreds of years, man has been able to figure time by a careful observation of the sun and the moon. For example, some ancient figured out that if you stick two poles in the ground and a third pole at a short distance behind the first two, you can determine a year  has passed from the position of the sun. Observation of the moon determines the length of a month. We can determine the equinoxes and solstices by observation, also.
So my question is this: How do you account for a week of seven days if you do not believe in the Genesis record of creation?

#astronomy, #earth, #equinox, #moon, #planets, #position-of-the-sun, #solar-system, #sun