They are fictions. But they are useful fictions—the scaffolding that allows a spinning rock to run on a schedule.
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: prime meridian and antimeridian
But two invisible lines on that grid tell a fascinating story of human ego, global cooperation, and literal time travel. They are fictions
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. passing through England