© Department of Physics, University of Guelph.

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1. The Earth has a circumference of about 40000 km. Calculate the average total power received at the outside of the Earth's atmosphere.

2. Calculate the ratio of the total power radiated from the Sun to the answer in the previous question.

3. Guelph is at 43.53º N latitude. What is the angle of the Sun above the horizon at high noon on September 22? Assuming 70% of incident solar power gets through the atmosphere, what will be the intensity at high noon on this date at Guelph? What will it be at the equator on the same day?

4. The Earth's axis of rotation is tipped by about 23.5º. Repeat question 3 for June 22.