# Source and license boundary

The runtime, adapter geometry derivation, tests and documentation in this directory were independently authored. No Horosa, Swiss Ephemeris or Astrolog application/calculation source was executed, translated, copied or distributed. No upstream implementation files were read for this work. Existing *independently authored* local SiderealProfiles, HouseSystems, Suite and Vedic modules were read and used through their APIs; they retain their own notices. The frozen sidereal prototype and main Site were not edited.

Production runtime uses the previously retained MIT Astronomy Engine (`vendor/astronomy.js`) and the independent local adapters. Astronomy Engine documentation: https://github.com/cosinekitty/astronomy/tree/master/source/js . The new UMD adapter injects dependencies and contains no reference-oracle data.

Primary factual references consulted on 2026-10-02:

- Swiss Ephemeris technical documentation, coordinate choices and house definitions, especially fixed-epoch plane intersections: https://www.astro.com/swisseph/swisseph.htm . The relevant distinction is between intersecting actual horizon/house planes with a chosen fixed plane and merely projecting old tropical cusp points.
- Public programming interface, house codes, `houses_ex`, `houses_armc`, `calc` coordinate flags and the solar-declination ABI field: https://www.astro.com/swisseph/swephprg.htm . Used only as API/factual documentation.
- Existing independently authored house-rule source ledger: the independent house-rule source ledger, retaining its primary definition references, Sunshine alias and domain choices.
- Frozen independently authored frame ledger: the independent profile numerical-verification and integration ledgers, including definitions/coordinate APIs and separate ephemeris/time-scale caveats.

Numerical validation used pyswisseph 2.10.3.2 (core 2.10.03) as a separate test oracle through its public APIs. Neither that package nor its fixtures are distributed in the website. Numeric fixtures are development evidence, not runtime interpolation or calibration.

Reference-compatibility differences are reported as observed differences of convention/frame behavior. They are not called proven upstream defects merely because residuals differ. Original direct vector invariants determine the present adapter's physical geometric meaning. Neither numerical agreement nor a traditional interpretive rule demonstrates scientific predictive efficacy.