Progressive needs of energy conscious design presume a realistic simulation of unsteady-state daylight situations linking skylight with sunlight during sunny periods. Typical momentary sky patterns have been suggested for standardisation based on an universal parametrisation system that allows the predetermination of the effective sky luminance distribution as well as the resulting diffuse skylight and direct sunlight illuminance either in absolute units or in ratios normalised to the extraterrestrial input. This universal system of modelling formulae and parameters is concisely described in this paper with the stress on its world-wide validity and applicability.
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