Angular aspects versus sign-based aspects
A comparison that separates invariant degree geometry from sign-conditioned aspect doctrines that can change with the zodiac frame.
Frame comparison · released 2026-08-18
Shared fact substrate
Subtracting the same ayanāṁśa from both points preserves their angular separation. A 180-degree opposition remains 180 degrees in either consistently transformed frame.
Required shared inputs
- Two retained tropical longitudes
- Lahiri offset
- Angular separation method
- Aspect set and orb
- Named sign-aspect doctrine
Tropical view
A tropical rule pack may use degree aspects, sign relationships, or both, based on tropical sign labels and its declared orb policy.
Lahiri-sidereal view
A Jyotiṣa rule pack may use graha dṛṣṭi, rāśi relationships, degree contacts, or another declared doctrine based on sidereal placements.
Where they agree
Frame conversion alone does not change pairwise angular distance. Exact degree-aspect timing is therefore shared when calculation conventions are otherwise identical.
Where they disagree
Sign-based relationships and technique eligibility can change. Graha dṛṣṭi and western aspect doctrine are also different rule systems, not alternate labels for one calculation.
Preservation policy
Store angular geometry once, then record each doctrine’s rule match separately with tradition, frame, aspect type, orb, and source passage.
Prohibited synthesis
Do not count the same angular separation twice as corroboration or translate one tradition’s aspect doctrine into another without an explicit sourced rule.
What empirical comparison requires
Treat tropical and sidereal outputs as separate candidate models. Any performance claim requires preregistered features, outcomes, horizons, baselines, model-selection policy, multiplicity control, and prospective scoring that retains misses and abstentions.
Method sources
These sources define calculation and namespace policy. They do not determine which astrology system is true.
- Celestial fact-layer specification
Maha Celestial
The shared instant, observer, ephemeris, reference-frame, precision, software, and provenance fields from which both chart frames are derived.
Boundary: Reproducible celestial geometry does not validate an astrological interpretation.
- Astrology tradition registry
Maha Celestial
Named, versioned rule namespaces and the separation between source provenance and empirical support.
Boundary: A well-sourced traditional rule remains an unvalidated interpretive claim unless separately tested.