How did people tell time before clocks?

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Tags

1. #greeks
2. #advanced
3. #around
4. #egyptians
5. #there
6. #early
7. #shadow
8. #clock
9. #within
10. #measure
11. #ancient
12. #water
13. #passage
14. #hours
15. #another
16. #permitted
17. #sundial