What is the International Date Line?
Quick Answer
The International Date Line is an imaginary line near the 180° meridian where the calendar date changes by one day. Crossing it westward adds a day, and crossing eastward subtracts a day.
The Full Story
The International Date Line is a human-made boundary that roughly follows the 180th meridian through the Pacific Ocean. It exists so that different parts of the world can keep a consistent calendar date. Because countries can choose their own time zones and exceptions, the line zigzags to avoid splitting nations and islands. For example, some Pacific island groups are placed on one side or the other for practical reasons. The line is essential for international travel, shipping, and global communication.
Key Facts
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"How can you travel across a line and gain or lose a day?"