Environmental Engineering Reference
In-Depth Information
Figure 2.11
The revolution of Earth around the sun. The
seasons are the result of Earth's tilted axis having a constant
orientation in space as Earth revolves around the sun.
Distances and sizes are not to scale.
Figure 2.12
Solar radiation (W m
-2
) falling on a horizontal
surface at the outside of the atmosphere.
Source: After Neiburger et al. (1982).