x is now each city's clock offset from home, not its longitude. Longitude only approximates time — zones are political, and against this roster it is off by up to 1.32 h (Tokyo), partly because New Orleans is on daylight time. So a city now sits exactly under its own local hour and an event N hours ahead lands on the living-that-hour city with no error at all. Latitude still sets y, and Tokyo really is south of Athens and Yerevan — 35.7°N against 38.0° and 40.2°. Events are invented; the roster is real.