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The arrangement of signs into four groups that are united by the same qualities and the shape of the triangle; equivalent to the elements: fire, earth, air and water. Signs of the same triplicity are harmonious to each other. Early sources gave each triplicity three planetary rulers: one that took priority by day, another that governed by night, and a third that was common to both sects– these were also used to judge the beginning, middle and end of things. Over time the third ruler became dropped from common employment and most texts refer to them having one planetary ruler by day and another by night

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