Prime meridian and international date line

International Date Line

prime meridian and international date line


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In other places, however, the IDL deviates east or west away from that meridian. Lawrence Island and St. Matthew Island. The IDL crosses between the U. Two US-owned uninhabited atolls, Howland Island and Baker Island , just north of the equator in the central Pacific Ocean and ships at sea between It follows that meridian until reaching Antarctica , which has multiple time zones. Conventionally, the IDL is not drawn into Antarctica on most maps.

When you cross the IDL, the day and date change. If you cross it traveling westward, the day goes forward by one, and the date increases by one. If you cross it traveling eastward, the opposite occurs. The IDL is not a matter of international law, but it's one of the few standards embraced globally. The IDL is crucial for global interconnectivity, instantaneous communication, time measurement and consistent international databases. It's mostly about convenience, commerce, and politics.

The prime meridian is the line of 0 longitude, the starting point for measuring distance both east and west around the Earth. The prime meridian is arbitrary , meaning it could be chosen to be anywhere. Any line of longitude a meridian can serve as the 0 longitude line. However, there is an international agreement that the meridian that runs through Greenwich, England, is considered the official prime meridian. Governments did not always agree that the Greenwich meridian was the prime meridian, making navigation over long distances very difficult.

President Chester A. The subject to discuss was the choice of "a meridian to be employed as a common zero of longitude and standard of time reckoning throughout the world". By the s there was pressure both to establish a prime meridian for worldwide navigation purposes and to unify local times for railway timetables. The first International Geographical Congress , held in Antwerp in , passed a motion in favour of the use of the Greenwich Meridian for smaller scale passage charts , suggesting that it should become mandatory within 15 years. The Post Office was by this time transmitting time signals from Greenwich by telegraph to most parts of the country to set the clocks.

Jump to navigation. Geographical terms sometimes become too intrinsic to get hold of, which is why students end up mugging the textual content. One of the most difficult topics to understand in geography is 'International Date Line', which talks about measuring degrees of longitude and latitude. Indeed, it is difficult to fuse mathematics in geography, but these calculations gave us the accuracy of time and distance. Earth is divided into imaginary lines called meridians that run from the north to the south pole.

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 timeanddate. 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, you 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 Tokelau you have to add 25 hours, or 1 day and 1 hour. Every day between and UTC , three different dates on the calendar are in use at the same time on Earth.

International Meridian Conference

What is the International Date Line?



What Is the International Date Line (IDL)?






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