A Satellite-Based Sky Luminance Model for the Tropics

Figure 10

Variation of the relative sky luminance (𝐿/𝐿_𝑧) with the zenith angle 𝑍 for solar zenith angle 𝑍_𝑠=58^∘ under clear sky (𝑛=0), intermediate sky (𝑛=0.5) and overcast sky (𝑛=1).