Sources

Effective 2026-04-20

Netra’s interpretive rubrics describe traditional astrological doctrine in our own words and cite original works as sources. We do not reproduce in-copyright modern interpretations. The source corpus is restricted to works whose copyright has expired under United States law (published before 1929, or authored by someone deceased at least 95 years).

Primary corpus (public domain)

• Claudius Ptolemy, Tetrabiblos — 2nd c. CE Greek; English via J. M. Ashmand (1822)
• Vettius Valens, Anthology — 2nd c. CE Greek; English via Mark Riley (released to public domain)
• Manilius, Astronomica — 1st c. CE Latin; multiple PD English translations
• Firmicus Maternus, Mathesis — 4th c. CE Latin
• Guido Bonatti, Liber Astronomiae — 13th c. Latin
• William Lilly, Christian Astrology — 1647 — the canonical horary text
• Jean-Baptiste Morin, Astrologia Gallica — 17th c.
• Placidus de Tito, Tabulae Primi Mobilis — 17th c.
• Alan Leo, collected works (d. 1917) — early modern Western synthesis
• Sepharial (Walter Gorn Old, d. 1929), collected works — early modern technique
• Charles E. O. Carter, early works (pre-1929 publications) — 20th-century structural astrology

Not used (modern in-copyright)

The following modern authors’ works are not reproduced or paraphrased in Netra’s rubrics, even where their interpretive frameworks are widely known: Robert Hand, Liz Greene, Stephen Forrest, Steven Arroyo, Demetra George, Bernadette Brady, Sue Tompkins, Robert Schmidt (including Project Hindsight translations), Dane Rudhyar, Marc Edmund Jones (Sabian symbols), Reinhold Ebertin (cosmobiology), and other in-copyright sources. Where Netra references a doctrine widely associated with these authors (e.g., midpoint analysis, symbolic-degree work, Hellenistic time-lord systems), it does so by referring to the public-domain antecedents and to the doctrine itself rather than to the modern formulation.

Birth-data sources

Netra computes charts from birth data you provide. If we publish interpretations of historical or public figures, the underlying birth data is sourced from primary records (autobiographies, official documents, news contemporary to the birth) where available, and treated as fact (not copyrightable). Curated chart databases (Astro-Databank, Astrotheme) hold copyright in their summaries and editorial notes; we do not reproduce that material.

Kriya

The astronomy is computed by Kriya (kriya.insightsbyomkar.com), an in-house implementation of VSOP87 (Mercury–Neptune), ELP2000-82B (Moon), IAU 1980 nutation, and a homegrown RK4 n-body integrator (Pluto). Kriya ships its own source inventory; see the SOURCES.md file in the Kriya repository for the full audit trail of rubric sources.

Reporting an issue

If you believe Netra has reproduced material in a way that infringes a copyright, please email admin@insightsbyomkar.com with the subject line “Source policy.” We take the allegation seriously and will review and revise as needed.