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Project
Repeat Activity 12.2 but replace the torch with an electric lamp. Then place the globe at different positions on a circle around the lamp while maintaining the tilt of the globe. (i) Note how much of the Northern and Southern hemispheres are illuminated at different positions. (ii) Rotate the globe and note the length of day and night on different parts. (iii) Repeat (ii) for different positions on the circle.
A tilted globe moving around a lamp like the Sun.
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Key Points
Moving the tilted globe around the lamp models how seasons form.
Key Points
- Use a lamp as the Sun and a tilted globe as the Earth.
- Move the globe around the lamp, keeping its tilt fixed.
- At some positions the North is lit more; at others, the South.
- Rotating the globe shows day and night lengths change.
- This models how the tilt causes the seasons.
The model shows how the tilt changes light and day length over a year.
