o n e h u n d r e d a n d o n e · 101 M A K E A M O D E L O F E A R T H ' S R E VO L U T I O N GEo LAB GEOGRAPHY WORKSHOP COLLECT the material you need to build an astronomical model, in pairs. BUILD the model. Decorate the ball to represent the Earth. Mark the two poles and the Equator on the ball. Write N (north) and S (south) on the corresponding hemispheres. Bend the wire as shown in the photos below. Pass the wire through the ball from pole to pole. Stick the model onto the polystyrene board. USE the model to show the Earth's revolution. Turn off the lights in the classroom and shine the torch on the ball. The torch represents the Sun. Spin the Earth anticlockwise. See how the light on one point on the ball changes. PRESENT your model to the class. Indicate where the Northern Hemisphere is in each photo. Explain what happens in the Northern Hemisphere in summer and in winter. A model is a representation of reality. It helps to show what something is like or how it works. You need a polystyrene board a torch a polystyrene ball wire a felt-tip pen wire felt-tip pen ball torch board A B In winter, the Northern Hemisphere is tilted... 5
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