Day, Night and Earth's Rotation
Earth spins once every 24 hours, causing the cycle of day and night and the apparent movement of the Sun across the sky.
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Play with the controls to see the idea in action.
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Earth spins once every 24 hours, causing the cycle of day and night and the apparent movement of the Sun across the sky.
- Rotation is west to east
- Time zones follow the Sun
- The Coriolis effect comes from the spin
🧠 Quick quiz
Three questions. Score 2 or more to complete the topic.
What is Day, Night and Earth's Rotation?
Within Earth & Environmental Science, which covers our planet, its resources and ecosystems, and how people can protect the environment, this topic explains Day, Night and Earth's Rotation. Earth and environment topics show how the planet’s systems shape landscapes, climate and life, with models that make these processes visible.
Check that you can explain Day, Night and Earth's Rotation in your own words and give one example from everyday life. If you can do that, you have understood the core idea.
Understanding Day, Night and Earth's Rotation helps you explain the environment around you and weigh up how people can protect it.
Day, Night and Earth's Rotation in detail
Earth spins on its axis once about every 24 hours, from west to east, so the Sun appears to rise in the east and set in the west. The side facing the Sun has day, and the side facing away has night. The rotation also causes the apparent movement of the stars and Moon across the sky.
Because Earth is a sphere, different places have different local times, which led to the creation of time zones. Rotation also creates the Coriolis effect, which deflects winds and ocean currents, curving them right in the Northern Hemisphere and left in the Southern. The speed of rotation at the equator is about 1,670 km/h.
How the interactive helps you understand Day, Night and Earth's Rotation
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 Day, Night and Earth's Rotation.
Real-life uses and examples
- Discuss how human activity changes Day, Night and Earth's Rotation, using a named example.
- Explain how Day, Night and Earth's Rotation affects the landscape or climate near you.
- Link Day, Night and Earth's Rotation to a real environmental problem and a possible solution.
Common mistakes to avoid
- Presenting one cause as the only cause of an environmental change.
- Describing a process without the timescale it works over.
- Learning the definition without testing it. Use the quiz and the interactive to check that you can apply the idea.
Frequently asked questions about Day, Night and Earth's Rotation
What is Day, Night and Earth's Rotation?
Earth spins once every 24 hours, causing the cycle of day and night and the apparent movement of the Sun across the sky.
What are the most important points about Day, Night and Earth's Rotation?
The main points are: Rotation is west to east; Time zones follow the Sun; The Coriolis effect comes from the spin.
Why is Day, Night and Earth's Rotation useful?
Understanding Day, Night and Earth's Rotation helps you explain the environment around you and weigh up how people can protect it.
How can I practise Day, Night and Earth's Rotation?
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 Day, Night and Earth's Rotation?
Related topics in Earth & Environmental Science include Space Exploration, Rocks and Minerals, Weathering and Erosion.