Time zone, a zone on the terrestrial globe that is approximately 15° longitude wide and extends from pole to pole and within which a uniform clock time is used. Time zones are the functional basis of standard time and were introduced in the late 19th century as railways connected places that had
Time in Canada - Wikipedia
How wrong is your time zone: Map shows how far world clocks are
Time in Russia - Wikipedia
6 crazy facts about time zones that every world traveler should
Geologic Time Scale — Earth@Home
World Time Zones EXPLAINED
Time zone, Definition, Map, & Facts
Africa Time Zone - Africa Current Time
Time Zone Map