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180°经线作为国际日期变更线,它是地球上“今天”与“昨天”的分界线,简称日界线。由于地球的自转运动,地球上各地的时刻依次推进,区时或地方时满24时后,日期也随之更替。由此可见,
The 180° warp is used as the international date change line. It is the dividing line between the “today” and the “yesterday” on Earth, and is simply called the dateline. Because of the rotation of the earth, the moments on all parts of the earth are pushed forward one after another. When the time is up or the time is 24 hours, the date will also change. This shows that