Synastry aspect library
Learn the aspect.
Keep the people in view.
Focused relationship guides for personal-planet and selected outer-planet contacts people actually search—each paired with a private check against two birth charts and a calculation receipt that shows orb and birth-time limits.
Aspect family
Mercury–Mercury
Communication & interpretation
Mercury Conjunct Mercury Synastry: Shared Language & Blind Spots
Read guideCommunication & cooperation
Mercury Sextile Mercury Synastry: A Usable Communication Opening
Read guideCommunication & friction
Mercury Square Mercury Synastry: Translation Before Argument
Read guideCommunication & flow
Mercury Trine Mercury Synastry: Easy Talk, Better Checks
Read guideCommunication & polarity
Mercury Opposition Mercury Synastry: Two Viewpoints
Read guideAspect family
Mercury–Saturn
Communication & structure
Mercury Conjunct Saturn Synastry: Serious Talk & Trust
Read guideCommunication & practical structure
Mercury Sextile Saturn Synastry: Structure You Can Use
Read guideCommunication & limits
Mercury Square Saturn Synastry: Criticism & Repair
Read guideCommunication & reliability
Mercury Trine Saturn Synastry: Clear Plans, Flexible Roles
Read guideCommunication & authority
Mercury Opposition Saturn Synastry: Voice vs. Authority
Read guideAspect family
Venus–Mars
Attraction & initiative
Venus Conjunct Mars Synastry: Chemistry, Timing, and Choice
Read guideAttraction & friction
Venus Square Mars Synastry: Desire, Friction, and Repair
Read guideAttraction & ease
Venus Trine Mars Synastry: Ease in Attraction and Initiative
Read guideAttraction & polarity
Venus Opposite Mars Synastry: Magnetic Differences in Love
Read guideAspect family
Moon–Moon
Aspect family
Sun–Moon
Aspect family
Moon–Venus
Comfort & affection
Moon Conjunct Venus Synastry: Feeling Loved in the Same Moment
Read guideComfort & translation
Moon Square Venus Synastry: Care That Lands Differently
Read guideComfort & ease
Moon Trine Venus Synastry: Easy Care, Real Appreciation
Read guideComfort & polarity
Moon Opposite Venus Synastry: Affection Across Two Needs
Read guideAspect family
Sun–Venus
Identity & appreciation
Sun Conjunct Venus Synastry: Being Seen Through Appreciation
Read guideIdentity & values
Sun Square Venus Synastry: Attraction With Different Values
Read guideIdentity & warmth
Sun Trine Venus Synastry: Warmth, Support, and Shared Enjoyment
Read guideIdentity & polarity
Sun Opposite Venus Synastry: Attraction, Differences, and Mutual Regard
Read guideAspect family
Moon–Mars
Emotion & initiative
Moon Conjunct Mars Synastry: Emotional Heat and Protective Instincts
Read guideEmotion & friction
Moon Square Mars Synastry: The Conflict Loop Beneath the Reaction
Read guideEmotion & ease
Moon Trine Mars Synastry: Emotional Courage That Can Move
Read guideEmotion & polarity
Moon Opposite Mars Synastry: Care and Pursuit on Opposite Sides
Read guideAspect family
Sun–Mars
Identity & initiative
Sun Conjunct Mars Synastry: Shared Momentum and Room to Be Yourself
Read guideIdentity & friction
Sun Square Mars Synastry: Autonomy, Friction, and Respectful Challenge
Read guideIdentity & ease
Sun Trine Mars Synastry: Confidence, Support, and Shared Action
Read guideIdentity & polarity
Sun Opposite Mars Synastry: Attraction Across Two Directions
Read guideAspect family
Moon–Saturn
Aspect family
Venus–Uranus
Aspect family
Mercury–Neptune
Aspect family
Sun–Pluto
What synastry adds
Look at how two charts meet, not just two sign labels.
Synastry compares placements from two birth charts. An aspect can be a useful way to reflect on the meeting point between identity, emotional needs, communication, affection, motivation, or first impressions. It cannot determine the health or future of a relationship.
Use an aspect as a question: where do we feel easy, where do we need more language, and what does care look like when this difference is activated? That keeps the chart in a proportionate role and keeps the people in the relationship visible.
Velvet Zodiac also keeps calculation confidence visible. If a Moon has no recorded birth time, the calculator tests its daily longitude window instead of promoting a single noon Moon as exact. Exact angles and receiving-house overlays require a usable birth time; the site omits them when that precision is not supported.
For a fuller reading, add the House Overlay Library to see where each person’s planets land directionally, compare the cross-chart contacts with the Composite Chart, then use the Composite Aspect Library to read the midpoint geometry. The Relationship Report keeps those lenses separate first, tests declared approximate-time ranges minute by minute, then classifies repeated themes as Reinforced, Counterbalanced, or Tension between lenses without turning them into a compatibility score.
Common questions
How should I read a synastry aspect?
Is one “bad” aspect enough to rule out a relationship?
No. No single aspect predicts a relationship outcome. Consider the broader chart, the relationship context, boundaries, values, and how the people involved actually communicate.
Do I need both birth times for synastry?
No. Many planetary contacts can still be compared without both times. When a Moon is untimed, Velvet Zodiac tests a daily Moon window and labels supported contacts Stable or Conditional instead of printing a noon Moon as exact. Rising, MC, and exact receiving-house overlays still require a usable birth time.