Q2 of 14 Page 62

Select the correct option :

If it is Wednesday 10 a.m. at 15° E meridian, then what will be the time at IDL.

The International Date Line is at 180 ̊. At 15 ̊ E, the time is 10 A.M on Wednesday.


The earth rotates 360° in 24 hours, which means 15° in 1 hour.


360° = 24hours, then 360°/24hours = 15°.


Therefore in 1° the earth takes 4 minutes.


60minutes/15° = 4 minutes. 1° = 4 minutes


Movement from 15 ̊ E to 180 ̊ E = 165 ̊


Change in time = 165*4 = 660 minutes = 660/60 = 11 hours


Time at IDL = 9 p.m

More from this chapter

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1

Two boxes in different hemispheres are given in the following diagram. The IDL passes through both the boxes. In one box, the meridian, day and date is given. Find the day and date for the other box.

 2

Select the correct option :

While crossing the IDL, a person will have to add one day when travelling from

 2

Select the correct option :

According to the international convention, at which meridian does the day and date change occurs?

 2

Select the correct option :

At which direction of the IDL does a new day start immediately?