The Earth rotates one complete turn every 24 hours to give us day and night. When Britain faces the Sun it is daytime in Britain but the other side of the world is in darkness. So, in Australia it is the middle of the night.

First broadcast:
12 October 2007

Pause the clip from time to time, to allow pupils to model the action of the Sun and the Earth, using a small globe (or ball) and a torch. While one pupil holds the torch steady, another rotates the globe in the torch beam. After viewing the clip, the children could go on to mark the apparent position of the sun in the sky at different times of the day, by placing sticky stars on a suitable window in the classroom. Ask pupils to note the position of the Sun in the sky when they arrive at school, at midday, and at home-time. Ask: "What happens over the day to the shadows cast by the Sun?" The children should observe that the shadows are longest at either end of the day and shortest at noon.