“ Longitude is a geographic coordinate that specifies the east–west position of a point on the Earth's surface relative to the prime meridian.” It’s looking go

“ Longitude is a geographic coordinate that specifies the east–west position of a point on the Earth's surface relative to the prime meridian.” It’s looking good for longitude so far. Looks like people somehow manage to measure relative longitudes ok after all. Let’s check time zones. “ You may notice, however, that the French collectivity of Saint-Pierre and Miquelon just to the south of Newfoundland is a half-hour ahead despite being at exactly the same longitude. By traveling west on the ferry from Newfoundland, you actually travel forward in time a half-hour.” Oops. So by travelling consistently west in the same direction you can actually go back into a time zone you’ve previously left without crossing the date line. Not looking good. There are actually several places on Earth where this is possible. Here’s another good one. Is Kaliningrad east of Lithuania, or west of it? “ All together, there are now three different areas where you gain two hours crossing time zones instead of just one. This also creates an unusual situation in the Kaliningrad Oblast exclave, which is now an hour ahead of Lithuania to its east, and two hours ahead of neighboring Poland.” Good luck constructing a consistent reference frame out of that.