Orientation efficiency of a Sun-tracking surface

The work uses common correlations of solar power engineering and spherical astronomy for measuring of orientation efficiency of a tracking surface. The presented formulas for calculation are supplied with the appropriate schemes of illumination. The research gives hour graphics, which depicts a dependence of the cosines of the angle of incidence of the surface of typical tracking devices for the periods of summer and winter solstice and equinox. The graphic materials are suitable for argumentation of the constructive decisions and comparative estimation of their efficiency.