Each of these

**longitudes**is called a degree. The 0 degree**longitude**passing through Greenwich, near London, is considered as standard and the**time**of all other**time**zones are calculated accordingly. The**time difference between**each**longitude**(each degree) is 4 minutes.Similarly, you may ask, what is the relationship between the longitude and time?

Longitudes run from North to South,from 0 degrees(which passes through Greenwich(England) and sometimes called the Greenwich Meridian)to 180 degrees East or West. Generally 1 degree difference in Longitude,

**causes**a difference of 4 minutes,with the longitude East always ahead in time.How longitudes are used to calculate time?

Because one day is 24 hours long one can easily

**use time**to**calculate longitude**. One hour of**time**difference corresponds to 15° of**longitude**(360°/24 hours = 15°/hour). Suppose an observer sets his accurate watch to 12:00 at noon in Greenwich, England and then travels a great distance.How many longitude is in each timezone?

The time in each successive time zone is one hour different from the times in neighboring time zones. To establish time zones, Earth's rotation rate of

**360**degrees of longitude per day was divided by 24 hours. The result shows that Earth turns**15**degrees of longitude per hour.