In Morocco the interplay between Ramadan, which moves with the lunar calendar, and daylight saving left the government changing clocks up to 4 times a year. Shifting daylight saving to avoid Ramadan helps Muslims observing the holy month, so they don’t have to delay breaking their fast.

But far from extreme latitudes, some places still shade blue. In far-western China, the sun doesn't rise until after 10am in early Jan. These are places where the clock runs far behind solar time—a place's natural time, where the clock would show noon when the sun is at its zenith.

That pale disc bouncing between the poles is polar day, where the sun never sets. The shadow sweeping in and out at the opposite pole is polar night, where the sun never rises. The Arctic Circle is defined by this phenomenon. It is the area where the sun won’t rise for at least 1 day a year.

This map shows the hour of sunrise globally through the year. It reveals time zones following national and, sometimes, regional boundaries, and slicing through the oceans.