Study on Treatment Method of Solar Azimuth Inflection Point based on Fitting Equation

The solar tracking equipment can carry out the real-time tracking according to the position of the sun, but the inflection point may occur during the calculation process of the solar azimuth. By fitting the curve at the inflection point, the fitting equation is obtained, and the mathematical model at sunrise and sunset as well as the inflection point is established to further optimize the fitting equation. In the engineering application, the moment when the inflection point appears can be obtained according to the fitting equation, in order to find the correct solar azimuth. The research results show that the maximum error of the solar azimuth calculated by this method is less than 0.25° by taking the solar position in Nanjing area (32.00°N) as an example, together with its simple calculation, achieving great convenience for the calculation of the solar azimuth in engineering applications.