Q13 of 40 Page 1

How many longitudes pass the sun in one hour?

15 degree of longitude passes under the sun every hour. By dividing 360 by 24 the answer we get is fifteen degree, in other words, the sun appears to move at a speed of 15 degrees per hour. The change is hardly noticeable in multiple human lifetimes however everything counts in large number.


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11

We have studied that the local time is different in different parts of the world. The daily routine of the people there is determined according to the local time in those places. Figure 1.3 shows the local times of different longitudes. Study this map and answer the following questions. Use the relationship between degrees and time for this.

A) Between which longitudes do the region experience daytime?


B) Which longitudes experience noon and midnight respectively?


C) Edward from New Orleans is on which longitude?


D) What is the time at Accra city?


E) At the same time, what is Sharad from Patna and Yakaito from Japan doing? What time is it in these cities?


F) Select any one longitude. Calculate the local time of the longitudes lying 1° to the west and east of this longitude.


 12

What is the maximum number of local times that can there be in the world?

 14

Look for the map of world time zones from reference books and see in which time zone India falls into?

 15

Mumbai is located at 73° E longitude. Kolkata is located at 88° E longitude. Find the difference between the longitudes of these two cities.