Unit 2 The globe Learner’s Book page 16 Unit focus


The focus of this unit is to learn about the Earth’s rotation on it’s axis and time zones in different hemispheres and places using the International Date Line. Learners will look at aspects of the seasons caused by the Earth’s orbit around the


sun: the summer and winter solstice, the spring and autumn equinox, lengths of day and night, and temperature changes.


Teaching guidelines


Most learners will be aware of world time differences because of live television broadcasts of sport such as soccer, rugby, tennis and cricket. In South Africa we have to get up early in the morning to watch a game played in Australia or New Zealand because these countries are eight to ten hours ahead of us in time. Use the globe and torch to illustrate how day and night are due to the Earth's shape


and rotation. If you do not have a globe, a soccer ball can be used too. Draw the outlines of the continents in a felt-tipped (Koki) pen on the ball so that learners can see where it is day and night.


Background information


When Magellan returned home after sailing around the world, he found that he had ‘lost’ a day. The reason for this is that he sailed west, across the International Date Line, which is the 180 degree line of longitude. If you cross this line going westwards you lose a day and if you cross it going eastwards you gain a day. You can sail across this imaginary line, and at that point one day will turn into another.


Resources


• A globe • Atlases • A wall map of the world • A torch • Satellite images to look at – see note under Teacher Guidelines on page 48 to see where you can get satellite images.


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