It is important to know solar energy potential before setting up any solar energy system. It is usually simulated, as the measurement is not easily attainable in every place. For this purpose, a computer program has been developed to determine solar radiation. The program, which is developed using Delphi language and can run under Windows operating systems, uses altitude, latitude, date, and temperature of the place as an input and both daily and monthly solar radiation containing direct, diffuse, and global can be obtained from output. Moreover, it provides solar radiation data to compute for horizontal and tilted surfaces.

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The solar radiation, as it comes through the atmosphere to the Earth's surface, can be used in a variety of fields, such as solar engineering, architecture, agriculture, and hydrology. It is important to investigate solar radiation, especially in a place such as Turkey, where solar-energy potential is high. Thus, in this study, the daily (during sunshine duration) and monthly average global, diffuse, and direct solar radiation in the Isparta (37 ı 18 0 and 38 ı 30 0 N latitude) region of Turkey has been obtained. In the comparison of calculated and meteorological data, a good agreement has been observed.