the soft aspects (trines and sextiles) are regarded as reflecting harmonious and potentially generative states of being in which those principles are fully present and mutually activated but in a manner that is generally less challenging, less dynamically evident
Tarnas establishes the sextile’s canonical definition within archetypal astrology as a ‘soft’ aspect marking harmonious archetypal confluence that is less dramatically evident in concrete events than hard-aspect alignments.
, Cosmos and Psyche: Intimations of a New World View, 2006thesis