Relationship astrology
Synastry Aspects
Synastry compares two natal charts to reveal the energetic connections between two people. Each aspect — conjunction, trine, square, opposition — creates a specific dynamic. These guides cover the 12 most-searched inter-chart aspects, from the warmth of Moon conjunct Venus to the intensity of Pluto conjunct Moon.
What is synastry?
Synastry is the comparison of two natal charts. When Planet A in your chart forms an aspect to Planet B in another person's chart, it creates a specific energetic connection between you. A conjunction (0°) brings two planetary energies into direct contact — maximum intensity. A trine (120°) creates harmonious flow. A square (90°) produces productive friction. An opposition (180°) creates polarity and fascination.
These inter-chart aspects don't determine your relationship's fate — they describe its energetic architecture. Understanding them gives you language for what you already feel.
Conjunction ☌
Sun conjunct Moon
The luminaries touching — instant recognition, emotional nourishment, and the risk of deep co-dependency.
Moon conjunct Venus
The warmth aspect — genuine mutual tenderness from early on. Both people feel cherished.
Venus conjunct Mars
The magnetic attraction aspect — you're pulled toward them before your mind has an opinion.
Sun conjunct Venus
Mutual admiration and social grace — the Venus person finds the Sun person radiant.
Moon conjunct Moon
Emotional twinning — same rhythms, same needs, same reactions. Can feel like a soul sibling.
Saturn conjunct Moon
Karmic weight — Saturn structures the Moon person's emotional life. Heavy, lasting, and demanding.
Pluto conjunct Moon
The most intense Moon aspect — transformative, sometimes obsessive, often impossible to forget.
Sun conjunct Ascendant
The Sun person embodies the Ascendant person's ideal — instant recognition and strong physical attraction.
Trine △
Square □
Opposition ☍
One aspect is not the chart
A single planetary aspect tells you about one dimension of your connection. A full synastry reading overlays every planet and point across both charts — typically 20+ aspects.
The composite chart
The composite chart is a third chart calculated by taking the midpoints of each person's planets — it represents the relationship itself as an independent entity.
Transits on the relationship
Current planetary transits aspect both your natal chart and your composite chart, creating windows of ease, challenge, or transformation in your relationship's timeline.
See your full synastry overlay
Astrelle calculates every planet-to-planet aspect between your chart and any other person's, generates your composite chart, and shows how current transits are moving through your connection right now.