Why is it called o clock?

Related questions

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5. What countries use AM PM?
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8. What is the difference between 12 AM and PM?
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Tags

1. #distinguish
2. #referencing
3. #sundial
4. #around
5. #slurred
6. #seventeenth
7. #century
8. #early
9. #which
10. #rather
11. #something
12. #sixteenth
13. #centuries
14. #later
15. #clock
16. #would
17. #sometime
18. #fourteenth