1 presents a case when sunlight shines on Earth at a lower angle (Sun closer to the horizon), the energy of the sunlight is spread over a larger area, and is therefore weaker than if the Sun is higher overhead and the energy is concentrated on a smaller area.

Figure 2 depicts a sunbeam 1 mi wide falling on the ground from directly overhead, and another hitting the ground at a 30° angle. Trigonometry tells us that the sine