Let's manipulate the figure...
- At what date is the declination a maximum ? What is the effect on the sun's intensity ? 
- At what date(s) are the sun's rays parallel to the equatorial plane ? What are the effects on the lengths of daytime and night-time ?
- For what regions of the globe is the sun sometimes directly overhead and when does this happen ? What is the effect on the climate ?
- The red arrow represents the sun’s rays. What is its trajectory, relative to the Earth, during the course of a day?
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