Q2. Two cities N and M are located at 150E and 150W of Greenwich respectively. What will be the difference in time between these two cities?
Answers
Answer:
The whole earth is divided into 24 time zones, 12 time zones for the west countries and 12 time zones for the east countries. One time zone covers a region of 360 degrees divided by 24 time zones. means that one time zone is 15 degrees.
From longitude 150 degrees east up to longitude of 150 degrees west is 300 degrees. Dividing 300 degrees by 15 degrees per time zone gives 20 time zones. This 20 time zones has 10 time zones in the west and 10 time zones in the east. The time of the west is 1 day late compared to the time of the east.
For example, at 45 degrees east, the local time is 3 A.M Monday while the corresponding time at 45 degrees west is 3 P.M. Sunday. It is not mandatory to bring in IDL in this time keeping.
The local time difference between two places having longitude 150 degrees east and 150 degrees west will be 20 hours.
The place at 150 degrees east will be 10 hours ahead of GMT (at 4 minutes per degree traveled) and the place at 150 degrees west will be 10 hours behind GMT.
Therefore the local time of the place at 150 degrees East will be 20 hours ahead of that of the place that is 150 degrees west of GMT.
Answer:
The local time difference between two places having longitude 150 degrees east and 150 degrees west will be 20 hours.
The place at 150 degrees east will be 10 hours ahead of GMT (at 4 minutes per degree traveled) and the place at 150 degrees west will be 10 hours behind GMT.
Therefore the local time of the place at 150 degrees East will be 20 hours ahead of that of the place that is 150 degrees west of GMT.
The IDL comes into play only when the local longitude crosses the IDL or is close to it where the Standard Time of the place w.r.t to GMT will be as per the internationally accepted time zone of that particular country or group of Islands.