ReadAstrology calculation methodology and evidence

Calculation Methodology · 11 minute read

Written and reviewed by ReadAstrology Editorial & Calculation Team. Published 2026-07-18T00:00:00-05:00. Modified 2026-07-18T00:00:00-05:00.

Key takeaways

• Local civil time must be converted with historical timezone rules.
• Every system publishes its coordinate, calendar, and reduction settings.
• AI never replaces deterministic chart calculation.

Methodology: This page documents the production calculation boundary and is updated when engine settings materially change.

Astrology and numerology are cultural and symbolic traditions, not scientifically validated methods for predicting events, diagnosing conditions, or guaranteeing outcomes.

Sources and calculation references

• Swiss Ephemeris General Documentation — Astrodienst AG. Planetary, lunar, house, aspect, and coordinate calculation background.
• Swiss Ephemeris Official Source Repository — Astrodienst. Implementation provenance, releases, data files, and licensing documentation.
• Orbits and Ephemerides — NASA Jet Propulsion Laboratory. Definition and role of ephemerides and solar-system position data.
• IANA Time Zone Database — Internet Assigned Numbers Authority. Historical civil-time offsets and daylight-saving rule provenance.
• Gregorian-Lunar Calendar Conversion Table — Hong Kong Observatory. Gregorian and traditional Chinese calendar boundary verification.

Compare calculation systems

Normalize local birth data

The system validates date, local civil time, coordinates, and timezone identifier. Historical timezone rules convert the local timestamp to UTC before astronomical calculations.

Ambiguous or nonexistent civil times around daylight-saving transitions require explicit handling rather than a silent guessed offset.

Calculate positions and chart geometry

Western and Vedic engines calculate ecliptic longitudes, speeds, angles, houses, and relevant derived points using declared ephemeris and zodiac settings.

Aspect records include both the target angle and measured orb. Vedic records include ayanamsha, sidereal Moon longitude, nakshatra, and period arithmetic.

Apply system-specific calendar rules

Chinese zodiac calculations check the correct lunisolar year boundary instead of January 1. BaZi calculations disclose stem-branch and civil-time conventions.

Numerology calculations show normalized characters, letter values, raw totals, and every reduction step.

Separate facts, interpretation, and AI synthesis

Calculated evidence is stored in structured fields. Traditional interpretation references that evidence, while AI synthesis is constrained to supported facts and labels uncertainty or contradiction.

Astrology remains a symbolic cultural framework. The methodology improves reproducibility and transparency; it does not make astrological prediction scientifically validated.

Frequently asked questions