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In a world in which people commonly travel great distances, it is necessary to have some means of keeping track of how the time of day changes in different parts of the world, and it is necessary to have an international date line. There is no absolute necessity for the international date line to be where it is; that was a reasonable choice but not the only possible choice. But we definitely need to have an international date line somewhere. At some point, the far east meets the far west, and one day becomes another day. It has to happen, for our time keeping system to make sense on a global scale. If you just stayed in the same city for your whole life, you would never need an international date line (or a passport). But in the age of jet airplanes, we travel a lot.

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11y ago

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