NCERT Class 6 Geography Chapter 2: Globe-Latitudes & Longitudes Complete Notes Part 3

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Globe - Latitudes & Longitudes

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International Date Line

  • Separates two consecutive calendar days

  • Has bends to include all of Kiribati, Samoa, Tonga and Tokelau in the Eastern Hemisphere.

  • GMT (Greenwich Mean Time) is now abbreviated as UTC (Coordinated Universal Time)

International Date Line

International Date Line

International Date Line

Now when we talk about time zone. You have the important thing to understand that is time zone. You have which a center of the time zone. If I talk about 0 degree Greenwich meridian. It’s a center reference point which runs from 7.5 degree east and 7.5 degree west. So whole 7.5 degree east and 7.5 degree west would have common time and that common time would be equalized and I would say standardized at 0 degree which is a reference point and that reference point is known as Greenwich meridian.

Now talk about International Date Line which is 180 degree and this separates two consecutive Calender days. Now this line bends, now originally all the meridian don’t have any bends, accept the international date line.

New International Date Line and Old International Date Line

International Date Line Detail

New International Date Line and Old International Date Line

Now only reason they have bends in an international date line is attributed to accommodate the island in a small territory. So that a same time is maintained within a country and there is no different time within a same country, again there was problem with an international date time. Accommodating Samoa so you had old International Date Line that cross the region, later on this International Date Line was modified to Samoa Island and that was this point on glow if we see you would say change in the International Date Line took place. This is about basics on latitude and longitudes.

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