Answer :
Final answer:
When traveling west across the International Date Line, one adds a day to their calendar. This practice is meant to maintain a consistent system of timekeeping worldwide. The line is arbitrarily positioned near the 180° longitude to avoid cutting through land as much as possible.
Explanation:
When you are traveling west across the International Date Line, you add a day to your calendar. This convention is established to maintain a rational system of timekeeping globally. The International Date Line is an arbitrary line on the surface of Earth near longitude 180° where the date changes.
This means, for example, if it's Monday on one side of the line and then you cross to the other side, it becomes Tuesday. A historic example of this could be seen during World War II, when the Imperial Japanese Navy bombed Pearl Harbor in Hawaii. In the United States, it was Sunday, December 7, 1941, but in Japan, it was already Monday, December 8.
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