Improvement of solar radiation model based on physical parametrization

In this paper, we describe a method of modeling the global solar irradiance on a clear sky. The proposed method is based on astrological phenomena, with which we can estimate the global solar irradiance of the few days, several months, and some years. To estimate the irradiance with high accuracy, it is necessary to calculate the solar radiation outside the Earth´s atmosphere taking into account the Earth´s revolution around the sun and rotation on its axis. Our proposed model is compared with data in the Chronological Science Tables as well as those measured on a horizontal surface. The simulation results using proposed model agree very well with the measured data.