While the Prime Meridian is a celebration of order, the Antimeridian is a celebration of chaos. It runs mostly through the middle of the Pacific Ocean—but it takes a few dramatic detours.
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