Esoteric System
Synastry Report — Relationship Compatibility Analysis
Generate a synastry compatibility report for couples. Book of Life analyses inter-chart aspects, harmony and friction scores alongside 12 other systems.
What is synastry?
Synastry is the astrological technique of comparing two natal charts to assess relationship compatibility. Originating in Hellenistic astrology (~150 CE) and modernised by Stephen Arroyo and Liz Greene, synastry examines how one person's planets aspect (geometrically relate to) the other person's planets and house cusps. Key factors include: Venus-Mars aspects (physical and romantic attraction), Moon-Moon aspects (emotional compatibility), Sun-Moon aspects (core identity harmony), Saturn aspects (commitment and challenge), and the composite chart (a mathematical midpoint chart representing the relationship itself).
How does Book of Life calculate synastry?
Two sets of birth data (date, time, place) are required. Book of Life computes both natal charts using Swiss Ephemeris, then calculates all inter-chart aspects between the 10 major planets, Ascendant, MC, and lunar nodes of both persons. It scores each aspect on a harmony/friction scale and derives aggregate compatibility percentages for emotional, intellectual, physical, and spiritual dimensions. The engine also identifies the dominant relationship theme keyword that characterises the partnership.
What does the synastry report include?
The report covers 10 sub-readings: overall compatibility score with breakdown by dimension, Venus-Mars interplay (attraction dynamics), Moon-Moon analysis (emotional language), communication compatibility (Mercury aspects), growth and challenge areas (Saturn, Pluto aspects), karmic connections (nodal ties), the relationship's dominant theme, strengths to nurture, friction points to manage, and a practical roadmap for the relationship's evolution.
Why use Book of Life for synastry?
Most compatibility tools offer a Sun-sign match ('Aries and Libra: 60% compatible'). Book of Life analyses the full charts — 10 planets, 12 houses, all aspects — producing a nuanced report that practitioners can resell as a premium couples reading. Adding Human Design type compatibility and numerological partnership numbers from the same platform creates a relationship analysis no single-system tool can match.
Try for free
bookoflife.guru — get 600 credits free. No credit card.