Sun conjunct Saturn in synastry is a very karmic aspect. It will be full of challenges and growth for both parties, but especially the Saturn person.Saturn in the natal chart shows what we have to learn and grow in to. The Sun person embodies these traits, that is intrinsically who they are. Being around the Sun person teaches the Saturn.. The sun represents the ego, while Mars. When Mercury in your chart forms an aspect to your partner's Mars, exchanges of ideas are stimulating and vigorous. You are inclined to challenge each other's ideas. 2. For the outer, synastry charts: Sun, Mercury, Venus, Mars, Jupiter, Saturn , Uranus , Neptune, Pluto, North Node, Chiron, Ceres, Pallas, Juno, Vesta (15 total). Also due to generational aspects, the husband's Pluto conjunct the wife's Neptune is in the Seldom category with a.