Answer :

Final answer:

The International Date Line marks the start of each day and does not follow the 180-degree meridian exactly due to political agreements.


Explanation:

180 degrees of longitude is called the International Date Line, opposite the prime meridian. It marks the start of each day and does not precisely follow the 180-degree meridian due to political agreements. The International Date Line ensures a smooth transition of dates across the globe.


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A. International Date Line