This article records tradition as it has been passed down and reported. Its sources are not yet part of the atlas's verified catalogue.
Minor Aspects gathers eight zodiac divisions the tradition treats with real suspicion, and the group's organizing fact is that most of its members entered astrology only because a degree based system could measure them, not because any older source described their effect.
Two, the Quincunx at a hundred and fifty degrees and the Semi-sextile at thirty degrees, were originally non-aspects entirely. In Hellenistic doctrine the signs they join share no element, mode or polarity and are in aversion, unable to see each other at all; twentieth century astrology reversed that reading and made both minor aspects of strain and low grade unease, a reversal traditional practitioners working from Greek and medieval sources generally reject outright.
Five more trace to Johannes Kepler, who introduced them in the Harmony of the World in 1619 from an argument that aspects should follow the regular divisions of the circle rather than the figures signs happen to make. The Quintile, seventy two degrees, a fifth of the circle, cannot exist in a sign based astrology at all, which is exactly why traditional practitioners reject it and harmonic astrologers count it a vindication; the Biquintile at a hundred and forty four degrees stands or falls with it. The Semi-square at forty five degrees and its companion the Sesqui-quadrate at a hundred and thirty five degrees are subdivisions of the square and are among Kepler's most widely accepted additions even among astrologers who discard the rest. The Novile, forty degrees, a ninth of the circle, has no place in classical or medieval material at all.
The Septile, a seventh of the circle, does not resolve into whole degrees, and some argue its whole delineation was reverse engineered from that irrationality.