The Romanesque architecture in the Iberian Peninsula was introduced through the Way of Saint James, as one of the main routes of pilgrimage of the XI century. This building fever would let us verify the ecclesiastical canons on the orientations of the Christian churches, as one of their main characteristics is definitely their eastwards orientation, which ideally would follow the astronomical equinox. This archaeoastronomical research should be completed by an ethnographic study of the astronomical traditions, as well as a research on the light and shadow effects of some of the monuments. This way we could recognize its value under an atronomical approach.