ABSTRACT
Solar energy or daylight utilisation for any site is dependent upon the quantity of the available flux. Obviously, the flux impinging upon any arbitrary surface undergoes monthly as well as diurnal variations. The measurement of the energy received from the sun, on horizontal as well as sloped surfaces, is an expensive affair. As such, few locations in the world have reliable, long-term measured irradiation data sets. Daylight records are even scarcer.
