In his 8th house is Jupiter in Sag, trine Mars. My natal Mars (libra, 5th) is conj jupiter, trine Saturn, square Neptune and Uranus and sextile Venus. His Mars (Leo, 3rd) is opp Venus, trine jupiter, square ascendant and opp MC. In comp we have Mars square sun and mercury, sextile Venus, trine Uranus and Neptune, trine South node, and conj chiron. Uranus in Eighth House Meaning in Synastry. Uranus in eighth house in synastry is usually a sign that the Uranus person will introduce some kind of change in the eighth house person's life. The Uranus person could enter the 8 th house person's life suddenly and their appearance might mark the beginning of a transformation in the person's. You need to harmonise your dark side with the light side, as there is no light without darkness and vice versa. It will transform your life for the better. This is especially true if you have other transit planets in the 8th house. Transit Pluto in natal houses : 1st, 2nd, 3rd. And in opposition to Venus/ Pluto /Uranus in the first.One source says that the 7th house of the composite and planets there shows the kind of relationships the relationship needs. When I look at the composite 7th with my husband, the cusp is at 29 Aquarius. But the whole 7th ... house is in Neptune with. . Transit Moon in the 8th. The Composite Sun in the Eighth House: Couples with the composite Sun in the Eighth House will experience profound inner transformation together, either through intimacy.