# 17-29-112

CIE standard clear sky

cloudless sky for which the relative luminance distribution is given by the luminance gradation function, φ(Z), which relates the luminance of a sky element to its zenith angle, Z

Note 1 to entry: For additional information, see ISO 15469/CIE S 011, Spatial distribution of daylight – CIE standard general sky.

Note 2 to entry: This entry was numbered 845-09-91 in IEC 60050-845:1987.

Note 3 to entry: This entry was numbered 17-164 in CIE S 017:2011.

Publication date: 2020-12