Why are there different timezones?

Related questions

1. Do the clocks change in South Africa?
2. Which time zone is the furthest ahead?
3. What time zone is Cape Town?
4. Is there time change?
5. What does EST and PST mean?
6. Are we in PST or EST?
7. Is est one hour ahead of CST?
8. What does 12 pm PST mean?
9. Is there a place 24 hours ahead?
10. How many hours apart are Eastern and Central time?

Tags

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