Fusion, major aspect
0°, 1/1
A conjunction joins two planets at the same point of the zodiac, fusing their meanings into a single drive. It opens every planetary cycle, and whether it feels easy or demanding depends on the planets that form it.
The conjunction merges two planetary principles so completely that the native experiences them as a single, undivided drive. There is no internal separation between the two energies — they act simultaneously, making their combined influence both highly focused and difficult to perceive objectively. The conjunction is, in effect, a personal blind spot: the native is so identified with the merged energy that they rarely see it from the outside.
Developmental arc
Learning to see and consciously direct a fused energy. The task is not to separate the planets, but to become aware of the combined signature and wield it deliberately rather than unconsciously. The conjunction often represents the area of life where a person is most intensely themselves.
Laser-focused potency. The two planetary principles reinforce and supercharge each other, producing extraordinary capability in the domain they govern. The native acts with natural authority and conviction in this area.
Compulsion, overwhelm, or narcissism in the matters ruled by the conjunct planets. Because the energies blend indiscriminately, a difficult conjunction (e.g. Mars-Saturn) can show up as stop-start effort or a recurring tug-of-war between assertive and restrictive impulses until the native learns to pace them.
A lasting pattern in one person
Marks a dominant psychological complex. The conjunct planets become a core engine of the personality. Their combined sign and house placement is one of the most defining features of the chart.
A moving planet meets a natal one
A transiting conjunction acts as a trigger or ignition. It marks the beginning of a new cycle between the transiting and natal planet — the conjunction is the 'new moon' phase of any planetary cycle. Events tend to be initiating, sudden, or unusually concentrated.
One person’s planet meets another’s
Creates powerful points of identification and intensity between two people. One person's planet landing on the other's often feels fated or magnetic. The nature of the planets involved determines whether the fusion is harmonious, challenging, or overwhelming.
Tradition
Ptolemaic / Babylonian
Also known as
In the sky now
Pairs among the Sun, Moon and planets within 3° of an exact conjunction, measured from Earth right now.
A conjunction forms when two planets stand at, or close to, the same degree of the zodiac. Astrologers read this as fusion: two planetary principles acting so closely together that the person living them often cannot tell where one ends and the other begins. With Mercury conjunct Mars, thinking and fighting arrive as one move, so the person tends to argue quickly and treat a debate as a sport.
The trine is called soft and the square hard, but the conjunction is classed as variable, because its tone comes almost entirely from the planets involved. Venus with Jupiter tends to feel generous and easy. Mars with Saturn tends to feel like effort under pressure. The Moon with Pluto tends to feel intense and private. Traditional astrologers put it in their own terms: meeting a benefic was a help, meeting a malefic a test.
The conjunction is also a beginning. Every cycle between two planets starts when they meet. The clearest example is the New Moon, the monthly meeting of the Sun and the Moon, when the Moon is invisible and a new month of light begins. A natal conjunction can be read in the same spirit: a seed, concentrated and still forming.
When a conjunction works well, the two planets back each other up and give unusual focus. Typical constructive expressions:
When a conjunction is strained, the same closeness becomes the problem: the pair acts automatically. Typical challenging expressions:
Convert to longitude
Venus at 12° Taurus: the sign starts at 30°, so add 12°.
42°
Convert to longitude
Mars at 17° Taurus: the sign starts at 30°, so add 17°.
47°
Measure the gap
47° − 42° = 5°, already the shorter way round.
5°
Compare with exact
The exact conjunction is 0°; the gap is 5° away from it.
orb 5°
Check the allowance
The standard allowance is 8°.
It counts
The conjunction is an angle of 0°. It does not divide the circle at all: as a fraction it is 1/1, the whole circle, and in harmonic astrology it is the first harmonic. Harmonic astrologers read each aspect by the number that divides the circle to make it: two for the opposition, four for the square, three for the trine. The number one stands for unity and identity, the circle before anything splits it, which is why the conjunction reads as fusion and beginning.
Sign relationship. Two conjunct planets usually sit in the same sign, so they share an element, a modality and a polarity. Venus and Mars together in Taurus both work through Earth, the fixed modality and yin polarity.
The out-of-sign exception. Close degrees can straddle a sign boundary. The Sun at 29° Gemini and Mercury at 2° Cancer are only 3° apart, a conjunction by degree. Yet Gemini is Air, mutable and yang, while Cancer is Water, cardinal and yin. This out-of-sign or "dissociate" conjunction is still counted by most modern astrologers, read as a less seamless blend: quick ideas coloured by feeling. Whole-sign Hellenistic astrologers would not have counted it.
| Step | Calculation | Result |
|---|---|---|
| 1. Convert Venus to longitude | Taurus starts at 30°, so 30 + 12 | 42° |
| 2. Convert Mars to longitude | 30 + 17 | 47° |
| 3. Subtract | 47 − 42 | 5° |
| 4. Take the shorter way round | 5° one way, 355° the other | 5° |
| 5. Compare with the exact angle | 5° minus the exact 0° | Orb of 5° |
| 6. Compare with the standard orb | 5° is inside the standard 8° but outside the tight 3° | A clear conjunction of moderate strength |
Applying or separating. Venus usually moves about a degree a day and Mars about half a degree, so Venus is the faster planet. Here Venus sits behind Mars and is catching up, so the conjunction is applying: building towards exactness. If neither planet turns retrograde, Venus closes the gap in a little over a week, passes Mars, and the conjunction becomes separating, loosening day by day. Retrograde motion can reverse this, so check the direction of both planets before deciding.
Every pair can form it. The conjunction is the one major aspect open to every pair of planets. Seen from Earth, Mercury is never more than about 28° from the Sun and Venus never more than about 47°. So the Sun can meet Mercury or Venus by conjunction, but among the major aspects nothing else is geometrically possible for those two pairs. Mercury and Venus, at most about 76° apart, can form a conjunction or a sextile and nothing wider.
An orb is the allowance either side of the exact angle within which astrologers still count an aspect. The conjunction gets one of the widest. These are the defaults used on stars.guide:
Hellenistic astrology treated two planets in the same sign as being together, a relationship often translated as co-presence, whatever their degrees. A meeting within about 3° by degree was treated as especially strong. Ptolemy listed four configurations, the opposition, trine, square and sextile, and handled the bodily meeting of planets separately.
William Lilly and other 17th-century astrologers gave each planet its own orb rather than giving each aspect one. To find the orb for a pair, take half of each planet's orb (its "moiety") and add them, which is the same as averaging the two. With the Sun at roughly 15° and the Moon at about 12°, a Sun–Moon conjunction would count within about 13½°.
Conjunctions with the Sun have their own traditional vocabulary, because the Sun's light overwhelms a planet near it. These are traditional measures, and modern astrologers use them unevenly:
Modern astrology mostly uses fixed orbs by aspect, often 8–10° for a conjunction and a little more when the Sun or Moon is involved. Harmonic astrologers following John Addey work with much narrower orbs, because they treat aspects as resonances that fade quickly away from exactness. Cosmobiologists following Reinhold Ebertin use tight orbs and read conjunctions together with midpoints, the halfway points between planets. A useful middle path: treat anything within 3° as central, 3–8° as real but shaped by the rest of the chart, and anything wider as a link to test.
A conjunction can also be the core of a larger shape. When three or more planets gather in one sign or house, astrologers call it a stellium, which concentrates a large share of the chart's energy in one place.
A natal conjunction marks a core engine of the personality. The sign shows its style and the house shows where it works. Venus conjunct Mars in the 5th house, for example, often points to someone whose creativity and romantic life run on the same fuel: they fall for people who make things, and make things to be noticed.
When a moving planet reaches a natal planet, it starts a new cycle between the two. Transiting Jupiter conjunct your natal Sun, roughly every twelve years, often coincides with a fresh start in confidence: a new role, a move or a decision to aim higher.
In synastry, one person's planet on another's creates strong identification. Your Moon on a partner's Sun is a classic marker of feeling at home with someone. A Saturn conjunction can feel steadying or heavy; the person whose planet is touched usually feels it most.
Most modern astrologers say yes, if the degrees are close, but they read it as a looser blend because the planets work through different elements and modalities. Whole-sign Hellenistic astrology would not count it.
It means the planet is within about 8°30' of the Sun, a traditional condition in which the planet's significations were read as hidden or weakened. Within about 17 arcminutes the planet is called cazimi and is read as strengthened instead.
A conjunction joins two planets. A stellium gathers three or more in one sign or house. It works like several conjunctions layered together, so it concentrates even more of the chart in one area of life.
Because every cycle between two planets begins when they meet. The faster planet then pulls ahead, forms a square, reaches the opposition at the halfway point and returns for the next meeting. The New Moon, the Sun and Moon together, is the monthly example.
A repeatable seven-step method for reading any conjunction, with a fully worked example.
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Every possible conjunction among the Sun, Moon, Mercury, Venus and Mars, with a concrete example and a growth edge for each pair.
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Concrete scenes, actions and pitfalls for living with a conjunction, plus five reflection prompts.
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How long conjunction transits last, why slow planets cross three times, and where the conjunction sits in a cycle.
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The complete atlas of conjunctions involving Jupiter, Saturn, Uranus, Neptune and Pluto, pair by pair.
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Co-presence, sect, reception, declination, the first harmonic, progressions and solar-arc conjunctions.
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Three fictional charts read in full, showing how sign, house, orb and sect change a conjunction.
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From Babylonian omens to great-conjunction history and modern harmonic theory, with a reading list.
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