After this lesson, the learner should be able to:

• Explain the function of the Sun
• Describe the structure of the Sun
• Know how long the Earth takes to spin on its own axis and to orbit the Sun
• Explain the tilting of the Earth's axis 
• Describe how the tilting of the Earth and its orbit causes the seasons 
• Define direct and oblique rays of light 
• Explain the seasons at the equator 
• Explain the seasons at the poles