MEASURING PROBABILITY OF SKY BRIGHTNESS IN CLASSIFICATION BY THE AVERAGE INSOLATION[J]. Journal of Civil and Environmental Engineering, 1993, 15(4). DOI: 10.11835/j.issn.1674-4764.1993.04.004.
According to the daily change law from curves for percentage insolation
this paper presents a new formula of the average insolation in the zones where the insolation is more than 70%. By means of the hourly observing data during two years for solar direct ratiation
cloudage and sunshine condition in seven zones different lighting climate
considering the vaper pressure and the altitude present the function of percentage insolation and the probability of four sky brightness classification
this formula has a certain precision to be proved by observation.