The Calculation of Illumination from Sun and Sky

Apr 01, 1940

Formulas are here given which express the connection between the height of the sun above the horizon and the illumination from sun and sky on a horizontal surface. With the aid of these formulas the average illumination on the ground can be calculated for any day in the year and for any hour whatever.

E. Elvegard
G. Sjostedt
Illuminating Engineering Journal
Published & professionally reviewed by: 
Illuminating Engineering Society (IES)

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