Geography
State the meaning of the International Date Line.
Latitudes & Longitudes
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Answer
The line of longitude 180° is one and the same for east or west of the Prime Meridian. Since it is diametrically opposite to the Greenwich Meridian, it causes a time difference of a full day on crossing the line.
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.
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Related Questions
State with an example how time lost or gained is computed with reference to the International Date Line.
Draw a well labelled diagram to show that places on the same longitude have the same time.
Give a geographical reason for each of the following:
(i) The International Date Line deviates and goes zig-zag near some islands in the Pacific Ocean.
(ii) The Greenwich time is called the Greenwich Mean Time.
(iii) Great Circles are the shortest routes between two places.Give a geographical reason for each of the following:
(i) Lines of longitude are called meridians of longitude.
(ii) Lines of longitude are of same length.
(iii) Diametrically opposite lines of longitude and the Equator are called Great Circles.