What Is the International Date Line and How Does it Work?
The International Date Line (IDL) on the map. The International Date Line is located halfway around the world from the prime meridian (0° longitude) or about ° east (or west) of Greenwich, London, UK, the reference point of time zones. It is also known as the line of demarcation. The Dateline Is Not Straight. Apr 04, · Map of the International Date Line. The IDL is an imaginary line that roughly follows the ° line of longitude and passes through the Pacific Ocean. However, this line is not straight and strays from the ° meridian at certain points. In some places, it appears as Author: John Misachi.
It is also known as the line of demarcation. It is not straight but zigzags to avoid political and country borders and to not cut some countries in half. On ma. When you cross the International Date Line from west to east, you subtract a day, and if you cross the line from east to west, maap add a day. Depending on which time zone the country follows, the time difference on either side of the line is not always 24 hours. For example, if you travel the kilometers miles across the dateline from Baker Island to Lne you have to add 25 hours, or 1 day and 1 hour.
Every day between and UTCthree different dates on the calendar are in use at the same time on Earth. Changing Sides of the Dateline The dateline is not defined by international law. Countries are free to choose the date and time zone that they want to observe. For example, when the Republic of Kiribati gained independence from being a British colony in some of the islands pine on one side of the dateline, and the rest were on the other.
They sate the anomaly in the eastern half of Kiribati by skipping January 1, and ever since Kiribati has been the first country to enter the New Year. They what day is veterans day observed this to facilitate trade with Australia and New Zealand, and Tokelau followed Samoa for the same reasons.
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The Dateline Is Not Straight
The International Date Line, established in , passes through the mid-Pacific Ocean and roughly follows a degrees longitude north-south line on the Earth. It is located halfway round the world from the prime meridian—the zero degrees longitude established in Greenwich, England, in International Date Line, also called Date Line, imaginary line extending between the North Pole and the South Pole and arbitrarily demarcating each calendar day from the next. Sep 10, · Thus, the degree line of longitude, exactly one-half way around the planet from Greenwich, England (at 0 degrees longitude), is approximately where the international date line is located. Cross the line from the east to the west, and you gain a Estimated Reading Time: 3 mins.
Elizabeth Borneman August 29, February 22, Maps. The International Date Line is located at degrees east or west of the Greenwich Meridian and is an imaginary line of longitude that differentiates between two different days. This is to account for the many time zones around the world to make it easier for people to know what time it is in various countries and to keep days uniform based on daylight hours.
The International Date Line separates two different days as the world turns. The conference was convened at the request of the President of the United States to determine an international time zone standard as the world began becoming more and more globalized. This has led to the movement of the date line in some cases at the behest of nations most affected by it.
The date line separates two consecutive calendar days which accounts for a gain or loss in a day when traveling around the world. The International Date Line has had to be amended as it passed through countries and cities who found it easier to be on the same time. Countries that were split by the International Date Line were often left up to their own devices when it came to changing time zones or instituting different practices for dealing with the date line mishaps.
Throughout the existence of the date line countries have merged time zones and changed the boundaries of the date line to make things easier. For instance, China instituted a one time zone policy instead of its previous 5 to unify country in ; the practice has continued to the present day. Russia also turned its eleven time zones down to 9 making it easier for the more populated parts of the country to work with the lesser populated areas in the north and east.
Some countries or cities choose to leave themselves in the middle of the International Date Line or a time zone; a city in Indiana, for instance, is located across two time zones! There are many reasons why a nation might choose to alter the International Date Line around its borders; politics, logistics, unity and more. When countries decide they want to change the date line to encompass their country or move it entirely out of the way they have to inform the public, inform cartographers to change maps, and tell the international community.
Often this involves skipping a day, as the island of Tokelau did in Samoa skipped a Friday when it adjusted the International Date Line to make it easier to do business with its major trading partner, Australia. Not everyone adjusts to the International Date Line changes that have been made.
Maps are still drawn with conflicting reports of where the line sits around the world, and critics think that the date line should be governed by an international body as it does affect how the entire world relates to one another. However, there are few hardliners when it comes to the International Date Line and the changes that nations like Samoa or Russia make to it to make their business run easier in the grand scheme of things. The International Date Line helps regulate time zones, nations, and the ways in which people communicate around the world.
Lane, Megan. How does a country change its time zones? BBC News. Web access 15 February Map showing the International Date Line. From Die Gartenlaube. Source: Wiki Commons , public domain. Share Tweet Pin. Explore More Geography Articles.