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Question
Give geographical reason.
IDL is proving to be very useful in today’s times.
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Solution
- The IDL brings coordination between international airlines, transportation services, economic and trade activities.
- The IDL has been carved out of the necessity of coordinating time and date.
- It is also important in today’s modern era and rapidly happening global developments.
- We can keep a track of all the calculations of a day and time accurately with the help of IDL in case of global transportation especially, with respect to airways.
- It is only because of the IDL that the schedules of the traffic worldwide are organised properly.
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RELATED QUESTIONS
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.

What considerations have been made while deciding the IDL?
Why is the IDL not a straight line like the 180° meridian?
Why doesn’t the IDL pass through land?
Using an atlas, tell if, on the following route, the IDL will be crossed and show it on the map.
Mumbai - London - New York - Los Angeles - Tokyo

choose the odd one.
choose the odd one.
Using an atlas, tell if, on the following route, the IDL will be crossed and show it on the map.
Delhi - Kolkata - Singapore - Melbourne

Using an atlas, tell if, on the following route, the IDL will be crossed and show it on the map.
Kolkata - Hong Kong - Tokyo - San Francisco

Using an atlas, tell if, on the following route, the IDL will be crossed and show it on the map.
Chennai - Singapore - Tokyo - Sydney - Santiago

