Time zones — Geography, 11–13 years
Understand why clocks show different times in different parts of Earth. Geography, 11–13 years.
One Earth, many clock times
Earth turns from west to east, so different places face the Sun at different moments. To keep local clocks useful, the world is divided into broad time zones. Moving east usually makes the clock later; moving west usually makes it earlier.
Why were they made?
Before standard time, each town could set its clock by the local Sun, which made travel and train timetables confusing. Railways and growing long-distance communication needed shared times. Time zones solved this by grouping places with similar solar time, while allowing some practical national choices.
Calling across zones
Suppose Lisbon is on UTC+0 and a city three zones east is on UTC+3. If it is 10:00 in Lisbon, add three hours: it is 13:00 there. If your friend calls at 20:00 in that city, subtract three hours to find 17:00 in Lisbon.
The lines are not exact
A natural mistake is to expect every time-zone boundary to be a straight line exactly 15 degrees apart. That follows the simple Earth-and-Sun model: 360 degrees divided into 24 hours. In reality, borders often bend around countries, and daylight-saving changes can alter the clock too.
A world that works together
Time zones matter when booking flights, joining an online lesson or watching a live event from another country. A timetable must say whose local time it uses, or people may arrive at the wrong moment. Computers often convert times automatically, but the geography behind the conversion remains the same.
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