Why are there 7 days in a week?

Related questions

1. Why is 17 unlucky?
2. What does it mean if your born on a Thursday?
3. What God is Sunday named after?
4. What does it mean to be born on Wednesday?
5. Why is Tuesday the 13 unlucky?
6. Has anyone won the lottery by picking their own numbers?
7. What is the most lucky number?
8. Is Tuesday a bad luck day?
9. Do you need an apostrophe for days of the week?
10. What is the meaning of Tuesday's child is full of grace?

Tags

1. #classical
2. #naked
3. #venus
4. #where
5. #these
6. #astronomers
7. #developed
8. #planets
9. #bodies
10. #mercury
11. #horoscope
12. #babylonians
13. #visible
14. #jupiter
15. #celestial
16. #assigned
17. #around
18. #saturn
19. #astrologers