01
NATARCA Celestial Engine™
The complete pipeline from local birth details and historical time zone to geocentric tropical positions, independently calculated angles, Whole Sign houses and aspects.
Methodology and transparency
Calculated data, traceable meaning
NATARCA Celestial Engine™ is NATARCA’s complete chart-calculation pipeline. Its astronomical and chart-geometry components use MIT-licensed open-source software and documented ephemeris data. NATARCA Interpretation Framework™ transforms the resulting chart facts into structured reflective guidance.
Astrological and Tarot interpretations are not scientific diagnoses, established astronomical facts or guaranteed predictions.
NATARCA Meaning Translator™ turns astrological and Tarot symbolism into text for self-reflection. It is not a scientific fact, diagnosis or guaranteed prediction.
Calculated FirstTraceable InterpretationIndependent Chart LogicNo FatalismPlain-Language InsightPrivacy by Default
02
NATARCA Interpretation Framework™
A versioned framework that turns the structured chart into ten plain-language reflection sections without modifying the calculation.
03
NATARCA Clarity Trace™
Open “Why am I seeing this?” to inspect the placements, houses and aspects behind an important statement.
04
NATARCA Meaning Translator™
A versioned, deterministic meaning layer that explains verified chart facts and randomly drawn Tarot cards in clear everyday language. It never changes calculated data.
05
NATARCA Relationship Resonance™
A transparent synastry layer for harmony, attraction, tension and growth, without a fabricated scientific percentage.
06
NATARCA Arcana Reflection™
A separate, genuinely randomized Tarot experience for symbolic reflection. It is not part of the astronomical calculation.
07
NATARCA Deep Chart™
The advanced chart experience keeps extended objects optional so the core reading remains clear.
08
NATARCA House Geometry™
Versioned Placidus, Whole Sign and Equal house cusps, angles, house placements and transparent polar fallback.
09
NATARCA Extended Points™
Clearly classified nodes, Chiron, Lilith, four validated asteroids and calculated points with supported ranges.
NATARCA Chart Logic v2
Tropical zodiac · geocentric positions of date · Placidus by default · selectable Whole Sign and Equal Houses · published aspect orbs · no mixed calculation sources.
When birth time is unknown
Planetary positions use a clearly marked local-noon reference. NATARCA does not calculate the Ascendant, Midheaven or houses, and shows uncertainty when the Moon could change signs.
Third-Party Notices
Caelus · Astronomy Engine · MIT
Astronomical calculations powered by Caelus 0.23.0 for Chart Logic v2 and by Astronomy Engine 2.1.19 for reproducible Version 1 charts, both used under the MIT License. Chart construction, interpretation architecture and user experience by NATARCA.
Caelus 0.23.0 — MIT License — Copyright © 2026 caelus contributors. Astronomy Engine 2.1.19 — MIT License — Copyright © 2019–2025 Don Cross. Package and data-pack notices, source commit and checksums are retained with the application source.
NATARCA is not affiliated with or endorsed by NASA, JPL, Astrodienst or the creators of the underlying open-source libraries.
View Caelus and its MIT LicenseView Astronomy Engine and its MIT License