As far as i know its because the catholics believe God created the earth in 6 days and rested on the 7th. So people waited for the 7th day, aka sunday, to rest and the calender was made with this idea.
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Yes, there are 7 days in each week.
there are 7 days in a week because it took God 7 days to build the world.
7 days in a week
Each day is 1/7 of a week (because there are 7 days per week).
A week is seven days, so six days is 6/7 of a week.