How do you determine time zones?

Related questions

1. Why are there time zones?
2. Who discovered 24 hours in a day?
3. Why do we kiss at midnight on New Year's Eve?
4. Which country has the shortest night time?
5. Does Michigan have 2 time zones?
6. Which country has no night only day?
7. Does Alaska have two time zones?
8. Are all time zones on the hour?
9. Which country has the latest time zone?
10. Why is there 60 seconds in a minute?

Tags

1. #degrees
2. #divide
3. #rotates
4. #important
5. #earth
6. #latitude
7. #hourly
8. #lines
9. #known
10. #divided
11. #every
12. #plays
13. #imaginary
14. #number
15. #determining
16. #factor
17. #longitude
18. #zones