Add to favorite locations. The International Date Line, also called the Date Line, is an imaginary line extending between the North Pole and the South Pole. It marks the time zone border where the date is actually changed by a whole day. 17. On most maps, it is shown as an uneven black line because there are some locations where the border has been shifted. When it is one calendar day (for example, January 1st) in places to the east of the line, it is the next calendar day (January 2nd) in places to the west. Meaning of international date line. When someone sails from East to West, they set their clock back one hour for every 15 degrees of longitude they pass. It arbitrarily demarcates each calendar day from the next. This definition of the International Date Line bears no legal recognition with countries able to set time zones at their discretion. Time difference from International Date Line West. International date line, established in 1884,passes through mid-Pacific ocean roughly following th 180° longitude opposite to that of prime meridian established in Greenwich, England, 1852. It is not a perfectly straight line and has been moved slightly over the years to accommodate needs … THE INTERNATIONAL date line (IDL) is the imaginary line on Earth slicing through the center of the PACIFIC OCEAN that separates two consecutive calendar days. The International Date Line is an imaginary line between the most northern and southern points…. The International Date Line exists for a specific reason. Login Harpoon When they pass the date line, they’ve gained a full 24 hours. Information and translations of international date line in the most comprehensive dictionary definitions resource on the web. The International Date Line is the imaginary line of longitude that separates two calendar dates. Learn more. International convention accepts the line as the location where one day is divided from the next, with the area in the Eastern Hemisphere one day ahead of the Western Hemisphere. The International Date Line sits on the 180º line of longitude in the middle of the Pacific Ocean, and is the imaginary line that separates two consecutive calendar days. https://oceanservice.noaa.gov/facts/international-date-line.html A good example of this application is China whose huge land area makes it cover several time zones but according to … the International Date Line definition: 1. The International Date Line, at approximately 180 degrees longitude, is an imaginary line on the Earth that officially marks the beginning of one day and the end of another. Moving west to IDL , its one day later. Countries in the Eastern Hemisphere to the left of the line up to the Prime Meridian are always one day ahead of countries to the right of the line and west of the prime meridian. 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