The trine between Sun and Moon brings together two fundamental drives: Sun's concern with the luminary of vitality, identity, and purpose — the core of the chart around which everything else revolves, and Moon's concern with the luminary of feeling, instinct, and the inner emotional world — the night-light of the chart.
The Nature of the Trine
120° — a flowing, harmonious angle between planets of the same element. The aspect of ease and natural talent.
How This Combination Works
When Sun and Moon are in trine, their energies cannot be understood in isolation. They interact, modify, and shape each other. Sun's drive is conditioned by Moon's influence, and vice versa. The trine describes the quality of this interaction: in harmonious flow, granting natural talent.
The result is a consistent pattern in the native's life — a characteristic way of handling the domains governed by Sun and Moon that reflects the quality of the aspect between them.
In Practice
This aspect shapes how the native express identity and purpose in relation to feel and respond emotionally. When the aspect is harmonious (sextile, trine), the two energies cooperate easily, producing talent and flow. When it is challenging (square, opposition), the two energies conflict, producing tension that must be consciously worked with. When it is a conjunction, the two energies are fused, operating as a single combined force.
The houses occupied by Sun and Moon indicate the areas of life where this pattern expresses itself most consistently.
Further Reading
See the full articles on Sun, Moon, and Trine for a deeper understanding of the forces at work in this combination.