Cross-chart aspects describe the specific angular relationship between one person's planet and another's. Different from sign-pair synastry, which compares two charts' Mars-to-Mars, Venus-to-Venus, etc. Cross-chart aspects map your Venus to their Sun, your Mars to their Moon, the specific geometric relationships across two charts.
On Zodiac Signals, synastry aspects readings cover 600 cross-chart combinations across the ten classical planets and six major aspects. Each reading uses interaction-physics grammar, describing the specific dynamic produced by the aspect mechanic (fusion, friction, see-saw, easy-flow, opportunity, misalignment) as applied to that specific planet pair across two charts.
These are read together with sign-pair synastry. Sign-pair gives the texture of the same planet across two charts; cross-chart aspects gives the relationship between different planets. Together they cover the structural and dynamic dimensions of any partnership.