Sources and References

Last updated: September 2026

This page explains the calculation libraries, traditional systems, and interpretive frameworks AstroMystra relies on. We separate verifiable astronomy from traditional astrology and from AstroMystra's own interpretation.

Astronomical Calculations

astronomy-engine for apparent geocentric ecliptic longitudes, lunar positions, sunrise and sunset calculations, and planetary motion checks.
IANA timezone rules resolved from location data before converting local birth time to UTC.
circular-natal-horoscope-js for tropical ascendant, Midheaven, and house cusps.

Vedic Astrology

Lahiri / Chitrapaksha ayanamsa for sidereal conversion, documented with the approximation used in Methodology.
Traditional 27-nakshatra divisions, pada quarters, and Vimshottari dasha sequence.
Standard Jyotish house counting rules for Mangal Dosha and whole-sign Vedic houses.

Western Astrology

Tropical zodiac signs measured from the seasonal equinox framework.
Placidus houses where mathematically valid, with whole-sign fallback at extreme latitudes.
Major aspect families: conjunction, sextile, square, trine, and opposition.

Numerology

Pythagorean letter-to-number mapping for name-derived values.
Birth-date reduction for Life Path, Moolank, Bhagyank, and personal year style calculations.
Master-number handling where the product explicitly supports it.

Tarot

Traditional 78-card tarot structure: Major Arcana and Minor Arcana.
Past, present, and future spread structure for the current in-app tarot reading.
Interpretive language is framed as reflection, not factual prediction.

Editorial References

Educational pages should distinguish astronomy, traditional claims, and AstroMystra interpretation.
When an article depends on a specific rule or historical source, the article should cite that source directly.
Corrections are accepted at hello@astromystra.com and tracked through the editorial process.

A Note on Traditional Texts

Astrological traditions contain multiple schools and historical layers. When AstroMystra references texts such as Brihat Parashara Hora Shastra, Brihat Jataka, Phaladeepika, or common Jyotisha teaching lineages, those references are treated as tradition-specific sources, not scientific validation.

Methodology