Conjunction

Origin and history

The system of major aspects, called the Ptolemaic aspects, was formalised in the Tetrabiblos of Claudius Ptolemy in the 2nd century CE, drawing on earlier Hellenistic and Babylonian sources. Ptolemy recognised five aspects: the conjunction at 0 degrees, the sextile at 60 degrees, the square at 90 degrees, the trine at 120 degrees, and the opposition at 180 degrees. The conjunction is the foundational aspect from which the others derive: it is the moment of meeting, the seed-point of any cycle between two planets.

In observational terms, the conjunction is what astronomers still call by the same name when two bodies appear close together in the sky. The Babylonian astronomers tracked the great conjunctions of Jupiter and Saturn, which occur approximately every 20 years, as markers of historical change. Johannes Kepler studied these conjunctions in the 17th century and connected them to the Star of Bethlehem in his 1614 work De Stella Nova. The synodic cycle of any two planets begins at their conjunction, completes at the next conjunction, and divides into the other aspects in between.

Meaning and dynamics

A conjunction in your natal chart describes a fusion of two planetary energies that you experience as a single complex faculty. Sun conjunct Moon blends will and feeling, conscious self and emotional life, and is most powerful at the new moon; Sun conjunct Mercury, possible up to about 28 degrees of separation, often gives a strongly identified mind. Venus conjunct Mars blends love and desire into immediate erotic charge. Conjunctions of malefics like Mars conjunct Saturn produce concentrated difficulty that can become exceptional achievement when integrated.

The shadow of the conjunction is loss of differentiation: the two principles cannot easily separate themselves to be experienced singly. A person with a tight Sun-Saturn conjunction may struggle to know whether they are tired or simply Saturn, depressed or simply taking responsibility. Working with a conjunction often involves consciously distinguishing the two principles so that they can act in concert rather than as a single muddled signature. The orb of a conjunction matters: a partile conjunction within 1 degree is much more intense than one near the outer edge of the orb. Conjunctions to the angles, particularly the Ascendant and Midheaven, are especially significant.

In practice

Transit conjunctions mark the start of new cycles. Transiting Jupiter conjunct natal Sun, occurring approximately every 12 years, traditionally marks a year of expansion. Transiting Saturn conjunct natal Sun, every 29 to 30 years, marks a profound restructuring of identity. Transiting Pluto conjunct any natal personal planet is an initiatory transformation that lasts for years. The new moon, when the Sun and Moon are conjunct, is the seed-point of each lunar cycle and a traditional moment for setting intentions.

In synastry, conjunctions between two charts are the strongest possible contacts. Your Venus conjunct your partner's Mars produces immediate attraction; your Sun conjunct their Moon creates a deep mutual recognition. In composite charts, which calculate the midpoints between two charts, conjunctions describe the core themes of the relationship itself. Stelliums, three or more planets in conjunction within the same sign, describe an unusually concentrated emphasis in one zodiacal area. Use your natal chart to identify your own conjunctions, and the daily horoscope to track current conjunctions.

Symbolic depth

In the cyclical view of astrology developed by Dane Rudhyar and others, the conjunction is the seed-point of any planetary cycle, comparable to the new moon. Each cycle has its own duration, its own quality, and its own characteristic phases. The Saturn-Pluto conjunction every 33 to 38 years, for instance, has marked moments of structural transformation in collective history: 1947, 1982, 2020. The Jupiter-Saturn conjunction every 20 years, sometimes called the great conjunction, marks economic and political cycles. The conjunction is therefore not just an aspect but a beginning.

Symbolically the conjunction is the alchemical conjunctio, the marriage of opposites that produces the new third. Jung saw the conjunctio as the central image of the individuation process, the moment in the work when the king and queen, sulphur and mercury, sun and moon, come together to produce the philosopher's stone. In the tarot, the conjunction principle is reflected in The Lovers at the level of choice and union, and in The World at the level of completion. Working with conjunctions means honouring the marriage of energies they represent and not trying to separate what life has fused. Continue through the glossary for the other aspects.

Also known as

• Konjunktion (German)
• Synodos (Greek)
• Coincidence
• 0-degree aspect
• Fusion