Computer Program for The Angles Describing the Sun’s Apparent Movement in the Sky

Abstract

The paper presents software developed for the determination of the Sun-Earth geometry. The variation of solar radiation availability at the Earth’s surface is easily understood from the geometry of the relative movements of the Earth. By means of a user-friendly interface, the computer program displays in a tabular or graphical manner the angles that describe the Sun’s apparent movement in the sky and the radiation received by a horizontal or tilted surface, for a desired period of time and a specific location.