The Conjunction at a Glance
| Symbol | ☌ |
| Angle | 0° |
| Type | Major aspect |
| Family | Harmonious |
| Orb | Up to 8° for inner planets, 10° for the Sun and Moon |
| Effect | Fusion, blending, mutual amplification |
| Key phrase | We are one |
What the Conjunction Is
A conjunction happens when two planets occupy the same degree of the zodiac. They sit on top of each other in the chart, often within a few degrees. The closer the orb (the angular distance), the stronger the aspect.
The conjunction is the most fundamental of all aspects because it is the only one where two planets are not connected across a distance. They are in the same place. They blend. The two principles work as one combined force for the entire life of the chart.
Conjunctions are classified as major aspects alongside the opposition, square, trine, and sextile. They are also called Ptolemaic aspects, named after the ancient astrologer who codified them.
Unlike other aspects, the conjunction is neither harmonious nor tense by nature. Its character depends entirely on the planets involved. A Venus and Jupiter conjunction is one of the most fortunate placements in astrology; a Mars and Saturn conjunction can produce frustration, restriction, and slow-burning anger. The geometry is identical; the planets are not.
The Geometry of the Conjunction
Two planets within 0 to 8 degrees of each other form a conjunction. The exact orb depends on the planets and the astrologer’s tradition. Most modern Western astrologers use:
- 0 to 3° for a tight conjunction (the strongest reading)
- 3 to 6° for a moderate conjunction (still very active)
- 6 to 10° for a wide conjunction (present but softer)
The Sun and Moon get the largest orbs in tradition because they are the two lights of the chart. Outer planets (Uranus, Neptune, Pluto) generally use tighter orbs because they move slowly, and their conjunctions are rarer and more weighted.
Conjunctions always occur within the same sign, except in the rare case where two planets straddle the cusp between two signs. When they do, the conjunction still works, but the planets express through different signs, which complicates the reading.
How the Conjunction Works
The two planets in a conjunction cannot act independently in the chart. They function as a single unit. Wherever one of them goes in the life, the other one comes with it.
When transits trigger one planet of the conjunction, they trigger both. When the conjunction is being interpreted, both planets must be read together. A natal Sun conjunct Mercury does not produce identity (Sun) and communication (Mercury) as two separate themes. It produces an identity built through speech, thought, and learning. The two cannot be separated.
The closer the orb, the more total the fusion. A conjunction within one degree produces the strongest blend. A conjunction at six or seven degrees is still a conjunction, but the two planets retain slightly more of their individual flavour.
The sign the conjunction falls in colours the whole expression. Two planets in Aries carry the cardinal fire of beginnings; the same two planets in Pisces dissolve and flow. The house position then determines the area of life where the conjunction plays out.
Major Conjunctions Through the Planets
The character of any conjunction depends on which planets are involved. Each pairing carries its own flavour.
- Sun conjunct Moon. Identity and inner life are fused. The conscious self and the emotional self work as one. This conjunction happens at the New Moon, and people born on a New Moon often have a strong sense of unified self, though sometimes a difficulty separating mood from identity.
- Sun conjunct Mercury. Identity through mind. The Sun and Mercury are never more than 28° apart, so this conjunction is common. It produces people whose sense of self lives in their speech, writing, and ideas.
- Sun conjunct Venus. Identity through love and beauty. Venus is never more than 48° from the Sun, so this is also common. It produces charming, often visibly attractive people. The self shines through warmth and aesthetic sense.
- Sun conjunct Mars. Identity through drive. The native lives close to the body, the action, the will. Often athletes, soldiers, entrepreneurs. Can produce hot tempers when in fire signs.
- Sun conjunct Jupiter. Identity through expansion. Generous, optimistic, often lucky. The Sun and Jupiter together produce people who walk into rooms with size, whether physical or in spirit.
- Sun conjunct Saturn. Identity through structure. Serious from childhood, often weighed by responsibility. The Sun and Saturn together produce people who feel old young and young old.
- Moon conjunct Venus. Inner life is loving. Often produces deep emotional attunement, strong feeling for beauty, gentle interior. Common in artists.
- Moon conjunct Mars. Inner life is fiery. Strong emotional reactions, sometimes anger as a default mood. The Moon and Mars together produce people who feel intensely.
- Mercury conjunct Venus. Mind and love merged. Often poets, lyric writers, charming speakers. Words and beauty live in the same place.
- Venus conjunct Mars. The classic relationship aspect. Love and drive fused, often a strong sex drive, often charismatic. Venus and Mars together describe how one loves and how one pursues.
- Jupiter conjunct Saturn. A generational aspect happening roughly every twenty years. Combines expansion and structure. Often produces people who can both build large and build carefully.
- Conjunctions with the outer planets (Uranus, Neptune, Pluto) tend to be generational at the very slow level and personal only when the outer planet conjuncts a personal planet (Sun, Moon, Mercury, Venus, Mars).
Conjunctions in the Houses
The house where a conjunction sits is the area of life where the merged planets actually act. Two planets conjunct in the first house show up in the personality. The same conjunction in the tenth house shows up in career. In the fourth, in family and home.
The cusp closest to the conjunction matters. A conjunction within a few degrees of the ascendant, IC, descendant, or midheaven is amplified, because angles strengthen any planet near them.
Empty houses are not necessarily quiet, and houses tenanted by a conjunction are not necessarily noisy. The strength depends on the planets, the sign, and the rest of the chart. But a conjunction is always one of the most active points of the chart.
Reading a Conjunction in Your Chart
To read a conjunction:
- Identify the two planets. Look at what each one rules and what each one does. The conjunction will express both, fused.
- Note the sign. The sign colours the whole expression. Venus conjunct Mars in Aries acts differently from Venus conjunct Mars in Capricorn.
- Note the house. The house tells you the area of life where the conjunction plays out.
- Check the orb. A tight conjunction (0 to 3°) is much stronger than a wide one (6 to 10°).
- Look at the rest of the chart. Other aspects to either planet of the conjunction will affect how it operates. A trine to a third planet softens the conjunction; a square strains it.
Conjunctions are rarely subtle. They tend to be the loudest part of a chart, and the qualities of the merged planets tend to define a significant portion of the native’s life.
Frequently asked questions
Most astrologers use up to 8 degrees for major planets, and up to 10 degrees for the Sun and Moon. A tight conjunction (within 3 degrees) is the strongest. A wide conjunction (6 to 8 degrees) is still active but less defining.
Neither, on its own. The conjunction takes the character of the planets involved. Venus conjunct Jupiter is fortunate. Mars conjunct Saturn is difficult. The geometry is neutral; the planets give the flavour.
A stellium is three or more planets in conjunction (or in the same sign or house). It is essentially a multi-planet conjunction. The reading is the same in principle, but stelliums concentrate enormous energy in one place and often dominate a chart.
Yes, but the reading changes. If two planets sit at 29° of one sign and 1° of the next, they are still close in degrees but express through different signs. Some astrologers consider this a weakened conjunction; others read it as the two planets still merging but each carrying its own sign flavour.
The conjunction still merges them. The two energies have to work as one, which can produce internal tension when the planets are inherently different in nature. Mars conjunct Saturn is a classic example: drive (Mars) and restriction (Saturn) live in the same place and have to negotiate constantly.
Yes. In synastry (comparing two charts), a conjunction between one person's planet and another person's planet creates the same fusion effect. The two people experience that placement together, with both planets active at once whenever they meet.