Letter | Published:

Solar Radiation on Inclined Surfaces

Naturevolume 204pages669670 (1964) | Download Citation



CALCULATION of the probable intensity of solar radiation on a surface which is inclined to the horizontal and at any attitude or azimuth relative to the Sun's meridian is frequently necessary in solar engineering research. The usual practice has been to perform such a calculation by separating the direct component of insolation and the diffuse component of sky radiation and to combine these according to the geometry of the system1. The assumption is made that the sky radiation is uniformly distributed from all directions, but this is known not to be the case for bright Sun or cloudless conditions, when the diffuse radiation is more intense in the vicinity of the Sun2. Hence the normal procedure as already described here is not valid except for surfaces which are horizontal.

Access optionsAccess options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1

    Robinson, N., and Rechnitzer, D., Coopération Mediterranéenne pour l'Energie Solaire, No. 4, 18 (1963).

  2. 2

    Kandratyev, K. J., and Manolova, M. P., Solar Energy, 4, No. 1, 14 (1960).

Download references

Author information


  1. The Woolwich Polytechnic, London, S.E.18



  1. Search for HAROLD HEYWOOD in:

About this article

Publication history

Issue Date



Further reading


By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.