Modeling the Paths of the Sun Using GeoGebra

Abstract

In this document we describe the necessary constructions for modeling the apparent position of the Sun in the sky in GeoGebra. We discuss how to build a planet that moves and rotates about its axis and a way to position the observer at a given latitude from which we will compute the horizontal coordinates of the Sun. Later these computed coordinates are represented in a celestial sphere where the horizon plane for the observer is fixed, giving the apparent track of the Sun at different days of the year.