A didactic model-object of the Sun apparent movement in relation to the background stars

Abstract

"Why does not the Sun move through the Orion's constellation?" The answer to this student's question begins with a literature review of models, especially those referring to didactic model-objects. Initially, the question is answered using a sky map, which is then transformed into a cylinder, and finally it is assembled into a didactic device to materialize the apparent movement of the celestial vault in a choosen latitude; in fact, this device works like a small-size planetarium. However, in order to reach a level of response that includes concepts such as the vertical of the observer's place, the orientation invariance of the Earth rotation axis vector, the celestial equator and the ecliptic, other models are needed. Finally, we conclude that there is not only one, but a linked set of didactic models that can lead to an acceptable answer to the original question.