Aspect · 0° · dynamic
Conjunction in Astrology: Meaning, Angle and Orb
A conjunction is a 0° relationship in which two planetary functions occupy the same zodiac region. Traditionally that is read as concentration and blending, with the planets involved deciding whether the blend is easy, demanding, or both. Its meaning changes with the two planetary functions and the life areas where their shared signal is calculated.
Editorial review by Luis PhamMethodology
Geometry and calculation facts
An aspect is a measured angular relationship between two chart points. The exact angle names the geometry; interpretation depends on the planets, signs, houses and chart context.
- Exact angle
- 0°
- Orb rule
- 8° maximum in the modern-major-v1 natal profile
- Orb formula
- orb = absolute value of measured separation minus exact angle
- Reference calculation
- equal houses · 1.13.0 engine · Adjacent signs can still contain a conjunction when their calculated longitudes are close enough. Sign labels alone do not prove or disprove the geometry.
When two functions occupy one point
The bodies meet at the same longitude, so the exact angle is 0°. The calculation compares their positions rather than inferring a conjunction from sign names alone.
Canonical exact angle for a conjunction: 0 degrees. Conjunction examples report measured separation and calculated orb separately from that canonical angle.
Concentration, fusion and loss of distance
A conjunction combines two functions at one point, increasing focus and making their cooperation or conflict harder to separate.
It may feel concentrated: an impulse, need, thought, or limit arrives together with another planetary signal and asks to be understood as one live problem.
Give each side of the blend a job
Use the concentration to coordinate the two functions deliberately, giving each one a job instead of letting the louder symbolism speak for both.
Unintegrated conjunctions can fuse identity with one reaction, amplify a blind spot, or make a difficult combination feel inevitable because it is so familiar.
The pair decides whether the blend cooperates
A Sun-Mercury conjunction asks a different question from Venus-Mars or Moon-Saturn. Planetary functions determine what is being fused before any good-or-bad label.
How the engine decides a conjunction is present
The engine reports a calculated orb from the actual planetary longitudes. Tighter contact means closer geometry; no single universal allowance should be assumed for every pair.
The public chart model validates angle and orb; applying or separating phase is not used here as a separate editorial claim.
A conjunction is not the same in every chart type
In a natal chart, the conjunction is part of one person's pattern; in synastry it connects two charts; in transit work it is time-specific. These contexts must not be merged.
Conjunction: houses and angles require a valid birth time. For a conjunction reference, Moon contacts can change across an unresolved local-time interval, so this public definition does not confirm a person's natal contact without a calculated chart.
A conjunction is not automatically harmonious. The exact angle describes concentration, while the planets, signs, houses, and orb determine the actual reading.
Verify the measured contact in your chart
Calculate your birth chart or comparison to confirm the planets, exact 0° relationship, orb, signs, and houses involved.
A grounded way to test the interpretation
At work, a person may treat a strong immediate preference as both an emotional need and an identity statement. Naming the preference and the need separately can preserve the conjunction's focus without making one reaction speak for the whole chart.
Adjacent signs can still contain a conjunction when their calculated longitudes are close enough. Sign labels alone do not prove or disprove the geometry.
Common questions
- Can planets in adjacent signs still form a conjunction?
- Yes. The engine compares longitudes, not sign labels. Planets near a sign boundary can be in adjacent signs and still fall within the configured conjunction profile; the exact degrees and calculated orb decide inclusion.
Example chart
A calculated example in context
This synthetic chart was calculated with GetBirthChart’s gbc-astro engine v1.13.0. No customer data is used.
House system: Equal.
The synthetic input includes a birth time.
- Moon conjunction Mars · Planet A longitude
- 61.516237° longitude · 1.52° gemini · 1st house
- Moon conjunction Mars · Planet B longitude
- 61.087418° longitude · 1.09° gemini · 1st house
- Moon conjunction Mars · Measured separation
- measured 0.43° · canonical 0.0000° · orb 0.43° · separating
- Moon conjunction Mars · Exact aspect target
- Conjunction · 0.0000°
- Moon conjunction Mars · Result
- Moon conjunction Mars · calculated separating
- Mercury conjunction Mars · Planet A longitude
- 60.262432° longitude · 0.26° gemini · 1st house
- Mercury conjunction Mars · Planet B longitude
- 61.087418° longitude · 1.09° gemini · 1st house
- Mercury conjunction Mars · Measured separation
- measured 0.82° · canonical 0.0000° · orb 0.82° · applying
- Mercury conjunction Mars · Exact aspect target
- Conjunction · 0.0000°
- Mercury conjunction Mars · Result
- Mercury conjunction Mars · calculated applying
- Sun conjunction Venus · Planet A longitude
- 83.347225° longitude · 23.35° gemini · 2nd house
- Sun conjunction Venus · Planet B longitude
- 77.909560° longitude · 17.91° gemini · 1st house
- Sun conjunction Venus · Measured separation
- measured 5.44° · canonical 0.0000° · orb 5.44° · separating
- Sun conjunction Venus · Exact aspect target
- Conjunction · 0.0000°
- Sun conjunction Venus · Result
- Sun conjunction Venus · calculated separating
- Natal aspect profile
- modern-major-v1 · geometry-specific limits
- Fixture case
- 1996-06-14T04:12:00
These three contacts share conjunction geometry but join different functions. The measured separations and phases come from the canonical fixture; interpretation still depends on the planet pair and the wider chart.
Calculation details
Example ID: aspect-definition-conjunction. Repository test fixture with a complete input and engine output; no customer data is used.
Timezone: Europe/Lisbon.
Calculate your own chartSee the methodologyReview data sources
See the aspects in your chart
Calculate your birth chart to see which planets form a conjunction, and how tight each contact is.
See the aspects in your chart