Why are there time zones?

Related questions

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

Tags

1. #different
2. #others
3. #zones
4. #times
5. #longitude
6. #morning
7. #enter
8. #parts
9. #middle
10. #daylight
11. #places
12. #single
13. #would
14. #degrees
15. #night
16. #earth
17. #since
18. #evening