Synastry aspects explained
A reference library for Sun signs, planetary placements and synastry. Start with the information you have, understand the method, and keep uncertainty visible.
Check an aspect angleWhat is an aspect between two planets?
An aspect describes an angular relationship between two positions in the zodiac. The major angles commonly used in Western astrology are 0°, 60°, 90°, 120° and 180°. The orb is the distance from the exact angle. Calculating an angle is geometry; assigning relationship meaning to it is astrological interpretation.
Read the method first
- What are the two measured longitudes?
- Which orb convention are you using?
- What changes when you consider other chart factors?
Separate the inputs from the interpretation. Identify which chart factors are known, which depend on a birth time, and which conclusions go beyond what the information supports.
Read the distinction carefully
For a concrete check, enter 10° and 130° below: their separation is 120°, an exact trine. Enter 359° and 1° to see the zodiac boundary handled correctly: the smaller separation is 2°, not 358°. The chosen orb controls whether a nearby major angle receives a label.
Check an aspect angle
Already have two planetary longitudes? Compare their angular separation. For example, 10° Aries is 10° longitude; 10° Leo is 130°.
Orb conventions vary between astrologers. Six degrees is this tool’s starting setting, not a universal standard. No account or birth details are required.
Read further
When a Synastry Aspect Fits the Chart but Not the Relationship
A synastry aspect can describe potential, tension, or a role without naming the whole relationship. Learn how to test the contact in context.
Synastry Conjunctions: When Planet Jobs Collide
Learn how to read a synastry conjunction when the planets work differently, using orb, sign, roles, context, and a practical relationship example.
Synastry Grand Trine with One Hard Contact: How to Read the Pattern
A grand trine can make synastry feel natural, but one square or opposition shows where the relationship needs attention. Learn how to rank the pattern.
How to Read a Synastry Aspect When a Planet Is Retrograde
A clear guide to retrograde planets in synastry, applying and separating aspects, orbs, degrees, and the questions that make a reading useful.
Fixed-Star Conjunctions in Moon, Venus, and Mars Synastry
A fixed-star conjunction can sharpen a synastry reading, but only when the star is close and the Moon, Venus, or Mars story already holds.