Which Closely Follows the 180º Meridian is Called?
Option 1 is the right answer.
The International Date Line, established in 1884, passes through the mid-Pacific Ocean and roughly follows a 180 degrees longitude north-south line on the Earth. It is located halfway round the world from the prime meridian—the zero degrees longitude established in Greenwich, England, in 1852.
The International Date Line functions as a “line of demarcation” separating two consecutive calendar dates.