IEVref:845-29-112ID:
Language:enStatus: Standard
Term: CIE standard clear sky
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Definition: 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:

φ(Z)=1− e −0,32 cosZ MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai abeA8aQjaacIcacaWGAbGaaiykaiabg2da9iaaigdacqGHsislcaWG LbWaaWbaaSqabeaadaWcbaadbaGaeyOeI0IaaGimaiaacYcacaaIZa GaaGOmaaqaaiGacogacaGGVbGaai4CaiaadQfaaaaaaaaa@4672@ if 0≤Z< π 2 MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aabcdacqGHKjYOcaWGAbGaaeipamaalaaabaacdaGae8hWdahabaGa aGOmaaaaaaa@3DAE@ , and φ(Z)=1 MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai abeA8aQjaacIcacaWGAbGaaiykaiabg2da9iaaigdaaaa@3CCF@ if Z= π 2 MathType@MTEF@5@5@+= feaagKart1ev2aaatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHX garuavP1wzZbItLDhis9wBH5garmWu51MyVXgaruWqVvNCPvMCG4uz 3bqee0evGueE0jxyaibaieYdi9WrpeeC0lXdh9vqqj=hEeea0xXdbb a9frFj0=OqFfea0dXdd9vqaq=JfrVkFHe9pgea0dXdar=Jb9hs0dXd bPYxe9vr0=vr0=vqpWqaaeaaciWacmGadaGadeaaeaGaauaaaOqaai aadQfacaqG9aWaaSaaaeaaimaacqWFapaCaeaacaaIYaaaaaaa@3B47@ (at the horizon)

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.


Publication date:2020-12
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