Strongest Compatibility in Synastry (weight 4)
Sun conjunct Descendant 4
Sun conjunct or opposition Vertex 4
Sun conjunct North Node 4
Sun hard aspect (conjunct, semi-square, square, opposition) Sun/Moon midpoint 4
Sun in 7th house 4
Moon conjunct Descendant 4
Moon conjunct or opposition Vertex 4
Moon conjunct North Node 4
Moon hard aspect (conjunct, semi-square, square, opposition) Sun/Moon midpoint 4
Ascendant conjunct North Node 4
and one of the most strongest : sun (male) conjunct (female) moon