The use of solar energy found that this method mainly uses both direct radiation and scattered radiation that are too hot, and the impact of anti-radiation is very small. According to some angle calculation methods, some angles can be calculated, but there are always differences in the specific installation. If accurate calculations are not required, most of them are installed at the approximate angle of a region. And make corrections based on the data obtained in the specific situation.

Sun altitude angle=90 degree -the difference between the latitude of the place and the direct sun point