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

Figure 5-1. Global Irradiance on a South-Facing Surface Tilted 37° for the Equinoxes (days 80 and 266) and for the Summer and Winter Solstices (days 172 and 356). (AM is air mass and Z is zenith angle.)

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