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ICSE Class 9 Geography Question 16 of 22

Geographic Grid: Latitudes and Longitudes — Question 10

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Question

Question 3(b)

State with an example how time lost or gained is computed with reference to the International Date Line.

Answer

The International Date Line is the 180° line. When crossing this date line from the west to east a day is deducted or the time is fixed backward by one day. When crossing the International Date Line, from east to west, a day is added.

For example, if it is 8 pm Monday 25th December at Greenwich, it will be 8 am Tuesday, 26th December on crossing the 180° line from the east as time will be 12 hours ahead. But if one were to travel from west, it will be 12 hours behind or 8 am Monday, 25th December.