Time Zones
Time zones divide the world into regions that share the same standard time, because Earth rotates 15 degrees every hour.
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Play with the controls to see the idea in action.
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Time zones divide the world into regions that share the same standard time, because Earth rotates 15 degrees every hour.
- The world has 24 main zones
- The International Date Line is near 180 degrees
- Time moves ahead as you go east
🧠 Quick quiz
Three questions. Score 2 or more to complete the topic.
What is Time Zones?
Within Geography, which covers maps, landforms, weather, climate, population and settlements: understand how our planet and people connect, this topic explains Time Zones. Geography explains how places, people and natural processes connect, so each topic here combines a clear definition with a visual model.
Check that you can explain Time Zones in your own words and give one example from everyday life. If you can do that, you have understood the core idea.
Understanding Time Zones helps you explain patterns on maps and in the news, and make reasoned decisions about places and environments.
Time Zones in detail
Because the Earth rotates once every 24 hours, the Sun is overhead at different times in different places. The world is divided into 24 time zones, each about 15° of longitude wide, with Greenwich Mean Time (GMT) on the Prime Meridian. Places east of Greenwich are ahead, and places west are behind, by one hour for every 15°.
The International Date Line, near 180° longitude, is where the date changes: crossing it west to east repeats a day. Countries often adjust zones for convenience, and some use daylight saving time. Time zones matter for travel, communications and global business.
How the interactive helps you understand Time Zones
Watch the Earth model in the interactive. Use any sliders or buttons it offers to change the values and see how the Earth model responds.
Before you change anything, predict the result. Then change one value at a time and check whether your prediction was right. This is a quick way to build a correct mental model of Time Zones.
Real-life uses and examples
- Interpret a graph or map that shows Time Zones and say what it suggests.
- Describe a real place where Time Zones can be seen, using a map or photograph.
- Explain how Time Zones affects people, jobs and land use in a region.
Common mistakes to avoid
- Mixing up cause, effect and consequence when you explain Time Zones.
- Writing general statements without a named place or example.
- Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.
Frequently asked questions about Time Zones
What is Time Zones?
Time zones divide the world into regions that share the same standard time, because Earth rotates 15 degrees every hour.
What are the most important points about Time Zones?
The main points are: The world has 24 main zones; The International Date Line is near 180 degrees; Time moves ahead as you go east.
Why is Time Zones useful?
Understanding Time Zones helps you explain patterns on maps and in the news, and make reasoned decisions about places and environments.
How can I practise Time Zones?
Open the interactive at the top of this page and change the controls one at a time. Predict the result before each change, then take the three-question quiz. A score of two or more marks the topic as complete on this device.
Which topics are related to Time Zones?
Related topics in Geography include Plate Boundaries, Living with Tectonic Hazards, Weathering.