Final answer:
The longitude line located 180° from the prime meridian, on the opposite side of the Earth, is called the International Date Line. The International Date Line is an imaginary line that marks the start of each day and is not exactly at 180° longitude due to political agreements.
Step-by-step explanation:
The longitude line located 180° from the prime meridian, on the opposite side of the Earth, is called the International Date Line.
The International Date Line is an imaginary line that runs roughly along the 180° longitude line. It is opposite the prime meridian (0° longitude) and marks the start of each day. Each day officially starts at 12:01 a.m. at the International Date Line.
The International Date Line is not a straight line exactly at 180° longitude due to political agreements and adjustments made to accommodate certain islands or countries on different sides of the line.