Dantes associations do not appear to be correct according to this link   the Moon resembles Grammar Mercury may be compared to Dialectics  Venus may be compared to Rhetoric  the Sun may be compared to Arithmetic  Mars may be compared to music  Jupiter may be compared to Geometry  Saturn may be compared to Astrology   I did not mean to say that they were right or wrong in any objective sense but that the associations attributed to Dante in the article differ from those found here Convivio by Dante Alighieri