  After presenting the main characteristics of the Sky of Salamanca, we analyse
whether what is represented in it is motivated by astrological or astronomical
considerations. We will see that the astrological explanation based on the
system of planetary houses described in Claudius Ptolemy's Tetrabiblos does not
correspond to the planetary configuration we see in the salmantine vault.
Finally, we will conclude that the astronomical interpretation of the Sky of
Salamanca is justified by the representation of the Universe known in the 15th
century according to the Almagest, by the placement of the stars in the
constellations according to that work and by the dating of the painted
planetary configuration, which circumstantial evidence places in August 1475.
