In astrology, an angle of 120 degrees between two planets, believed to bring harmony; or anything arranged in groups of three.
From Latin 'trinus' meaning threefold. The term comes from astrology and ancient mathematical concepts about angles and triangles.
Astrologers love trines because 120 degrees is mathematically perfect—it's one of the few angles where planets 'lock in' to stable positions, which is why it was always considered lucky!
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