Sources
Primary references used across this site. Computational sources are authoritative for numbers; interpretive sources are cited per tradition.
Computational and astronomical references
- Astronomy Engine
MIT-licensed ephemeris engine. VSOP87 + ELP-2000 theories. Primary computational source.
- NASA JPL Horizons
Authoritative ephemeris. Used for spot-checking Astronomy Engine output.
- Swiss Ephemeris
GPL/commercial ephemeris by Astrodienst. Reference standard for astrological calculation.
- IAU Sky Coordinates
International Astronomical Union official constellation boundaries.
Hellenistic and classical Western
- Hellenistic Astrology — Chris Brennan
Brennan, C. (2017). Hellenistic Astrology: The Study of Fate and Fortune. Amor Fati Publications.
- Tetrabiblos — Ptolemy (2nd century)
Classical reference. Public domain. Used for traditional sign rulerships, exaltations, and dignities.
- Anthology — Vettius Valens (2nd century)
Earliest surviving extensive Hellenistic astrological text. Public domain translations cited.
Modern Western
- The Inner Sky — Steven Forrest
Forrest, S. (1989). Used for modern evolutionary interpretive language.
- Christian Astrology — William Lilly (1647)
Bridges classical and modern Western traditions. Public domain.
Vedic / sidereal
- Brihat Parashara Hora Shastra
Foundational text of Vedic astrology. Public domain translations.