In the former paper, All Sky Model to estimate the sky luminance and the radiance distribution that authors had proposed on 2004 was improved, and the improved model was compared with former All Sky Model, CIE Standard General Sky and Perez model.
Afterward, further examinations are repeated, and appropriate coefficients for the basic equation were derived applying the same structure of the basic equation, which can estimate high accurate sky luminance and radiance distributions of with small regional dependency.
When the range of the combination of coefficients of the CIE Standard General Sky was considered too much, the limit turned out in the estimating accuracy by the model. Some ranges of the combination of coefficients were arranged a little, the re-improvement was tried, and the coefficients for more high accurate estimation were derived.
In this paper, All Sky Model adjusted again is introduced.
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