Simple Solar Spectral Model for Direct and Diffuse Irradiance on Horizontal and Tilted Planes at the Earth's Surface for Cloudless Atmospheres

Figure 4-10. Comparison between Global Radiation on a South-Facing Surface Tilted 40°, Measured on 19 August 1981, Golden, CO, and Modeled Data Using SPCTRAL2 (o on the graph).

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