What Is an Astrology Synastry Report
An astrology synastry report compares two birth charts to identify aspects between their planets, angles, and houses. It maps interactions such as conjunctions, trines, squares, and oppositions between positions like Sun, Moon, Venus, and Mars. The report uses exact degrees, orb ranges, and house overlays to highlight emotional, communicative, and relational dynamics. Synastry is a core technique in natal astrology and is widely offered by online platforms and professional astrologers.
Synastry reports typically include a grid or table showing planetary pairings, aspect types, and orbs measured in degrees. Some services add composite charts, Davison charts, or relationship house overlays for deeper analysis. The data is derived from the exact birth date, time, and location for each person, then calculated using astronomical ephemerides and house systems such as Placidus or Koch. Accuracy depends on precise birth times and reliable coordinate data.
How Synastry Reports Are Generated and Used
Providers generate synastry reports by inputting two sets of birth data into astrology software that calculates planetary longitudes, latitudes, and house cusps. The software then applies aspect orbs and interprets the geometry of the chart pair according to selected rules or interpretive frameworks. Platforms such as Astro.com, Co-Star, and Cafe Astrology offer free or paid synastry tools that display aspect lists, aspect orbs, and chart overlays. These tools rely on standard astronomical calculations and public ephemeris data.
Users consult synastry reports for relationship insight, compatibility assessment, or timing guidance around partnerships. Some individuals use reports to understand communication styles, emotional needs, or conflict patterns between partners. Professional astrologers may integrate synastry into broader readings that include transit analysis, progressions, or relationship counseling frameworks. The reports are informational tools and do not constitute financial, legal, or clinical advice.
Market, Costs, and Technical Considerations
Online astrology platforms offer synastry reports at price points ranging from free basic views to premium tiers that include extended interpretations and relationship timing. Paid reports often provide deeper aspect analysis, composite chart overlays, and downloadable PDF summaries. The market includes both independent astrologers and large platforms that aggregate birth data and chart calculation services. Pricing and features vary based on the depth of the report, the number of aspects shown, and the level of interpretive text provided.
Technical quality in synastry reports depends on accurate ephemeris data, correct house system selection, and consistent orb definitions for aspects. Most systems use a default orb of 8 degrees for major aspects and narrower orbs for minor aspects, with exact aspects at 0 degrees orb. Users can verify calculations against public astronomical data and open-source chart calculation libraries. For financial and regulatory context, companies offering paid astrology services operate under general consumer protection and data privacy rules that vary by jurisdiction SEC.