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Sky Model

Hay

Hay, John E. "A revised method for determining the direct and diffuse components of the total short‐wave radiation." Atmosphere 14.4 (1976): 278-287.

Hay, John E., and Donald C. McKay. "Estimating solar irradiance on inclined surfaces: a review and assessment of methodologies." International Journal of Solar Energy 3.4-5 (1985): 203-240.

Perez

Perez, Richard, et al. "A new simplified version of the Perez diffuse irradiance model for tilted surfaces." Solar energy 39.3 (1987): 221-231.