MARK GARLICK / SCIENCE PHOTO LIBRARY MARK GARLICK / SCIENCE PHOTO LIBRARY
Diagram showing how the height of the Sun above the horizon varies with the seasons. In winter (left) the Sun is low down in the sky. Its rays strike the Earth's surface at an oblique angle for much of the day, resulting in less heating, as the light is more spread out and diluted. In the summer, the Sun is much higher. Its rays strike the surface at higher angles which causes a greater amount of heating.
Model release not required. Property release not required.