Environmental Engineering Reference
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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).
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