Question

Write in brief:

(1) What considerations have been made
while deciding the IDL?​

Answer 1

Answer:

Following points are taken into consideration while drawing an IDL

1.Direction of travel

2.Current day and date

Accordingly while travelling from east to west of IDL a day is added.

FOR EXAMPLE:While travelling from America to Japan,if it is Thursday 25th December Friday 26th December in Japan.

While travelling from west to east of IDL day remains same .

FOR EXAMPLE:While travelling from Japan to America if it is Thursday 25th December,only should be considered.

Answer 2

Explanation:

The crossing of the 180-degree prime meridian can result in the change of time zone. Thus some precautions have to be taken to avoid the confusions in the time zones. Thus the date and time may have to be changed to incorporate this. This has to be made by considering the Greenwich 180 degree prime meridian. Two precautions have to be considered while doing this-

• The direction of travel- The sun travels from east to west and the earth rotates from west to east. Thus the countries in the west, 12.00 at midnight is the end of the day and the countries of the east, it is the start of the day. This has to be considered.

• Current day and date- When we travelling across the meridian, the day and the date changes. While travelling from east to west, one day has to add to the day of commencing the journey. But while travelling from west to east, the same day is considered upon arrival.