The aspects between planets depict the multiple relationships taking part in an organism formation.
An aspect between planets or planets and sensitive points of the birth chart establishes a relationship involving the functions represented by the planets and the horoscope points. All parts of complex systems – be they biological organisms or, in our case, a planetary system – develop a network of relationships to ensure their integrity and completeness. An organism is formed when there is unity in diversity, and the planetary aspects combine to support this dynamic. We can think of them as vectors in the horoscope field (zodiac and Houses), which define the points of balance, resistance or opposition of the planetary functions; these processes shape the structure of an individual or entity in spacetime.
For an aspect to be meaningful, it must adapt to a specific numerical expression, representing the ideal model from which the planetary link draws its rhythm. The aspect can “oscillate” only on well-defined frequencies, where the number is the mathematical representation of this relationship. Logically, in a field system such as that represented by the astrological chart, all the elements express links. But only those that approach or correspond to the ideal model stand out at an interpretative level by their significant proximity to the symbolic vibration represented by the number.
Major and minor aspects
Within this structure, some ecliptic longitude ratios between the planets are considered more significant than others and are classified as major aspects: conjunction (0 °), opposition (180 °), trine (120 °), square (90 °) and sextile (60 °). Why these relationships and not others? For the aspects of conjunction and opposition, the meaning seems obvious: they represent the primordial dynamics of union and contrast; the planets in conjunction symbolise the spontaneous integration between the functions involved; the opposition is the planetary dynamic that develops through confrontation. The trine introduces the creative element that arises from the agreement between the parties; the square manifests the resistance that intervenes when reality and ideal collide; finally, the sextile portrays the relationship of non-conflictual closeness. More details are provided later on.
The astrological community has always debated the use of minor aspects in interpretation or prediction. They express a faint resonance that is difficult to associate with sufficient precision to aspects of the individual psychosoma or any event. Some authors place them in a frame of reference linked to certain psychological manifestations, or it is believed that becoming aware of these aspects requires a high degree of awareness on the part of the subject. However, some of these aspects seem more significant than others. The minor aspects are listed below in order of longitude: semi-sextile (30 °); semi-quintile (36 °); nonile (40 °); semi-square or octile (45 °); septile (51 ° 26 ‘); quintile (72 °); sesquisquare (135 °); biquintile (144th); quincunx (150 °). Among the minor aspects rarely used we have: the semi-octile (22 ° 30 ‘); the semi-quincunx (75 °); the tri-decile (108 °); the quindecile (165 °).