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    Explain the importance of empirical equations for predicting the availability of solar radiation
    Distinguish between Angstrom and Gopinathan Correlations for estimation of monthly average daily global radiation
    List the different correlations developed for estimating solar radiation under different climatic conditions.
    Compute the estimated hourly global, beam, and diffuse radiation on a horizontal surface, under clear skies.
    Compute the estimated total radiation on an inclined surface.