One line experiences the height of the day, while the other shivers in the dark of a new morning. They are opposite sides of the same planetary coin. We don’t need these lines to sail ships anymore. GPS handles that.
The Prime Meridian is the 0° line of longitude. It runs directly from the North Pole to the South Pole, passing through England, France, Spain, Algeria, Mali, Burkina Faso, Togo, Ghana, and Antarctica. prime meridian and antimeridian
We stare at world maps so often that we stop seeing them. The grid of latitude and longitude has become visual white noise—a necessary but boring backdrop to the shapes of continents. One line experiences the height of the day,
Because of how time zones work, the people living just east of the Prime Meridian are "behind" Greenwich time, while those just west are "ahead." But at the Antimeridian, that difference adds up to exactly 12 hours. That means: GPS handles that