How do you calculate longitude and time?

Related questions

1. What is GMT ET?
2. How GMT is calculated?
3. What time zone is GMT 4?
4. How many time zones does the USA have?
5. What GMT time zone is PST?
6. What time zone does Singapore use?
7. How was longitude calculated?
8. Are we in PST or PDT now?
9. What time is UTC in PST?
10. What is the GMT time now in Singapore?

Tags

1. #calculate
2. #longitude
3. #great
4. #suppose
5. #watch
6. #distance
7. #observer
8. #finding
9. #accurate
10. #travels
11. #easily
12. #difference
13. #hours
14. #because
15. #corresponds
16. #greenwich
17. #england