12 bounded comparisons · released 2026-08-18
Preserve the disagreement. Test the models separately.
Tropical and sidereal systems can share one celestial substrate while disagreeing about labels, chronology, technique eligibility, and interpretation. This collection records those disagreements without averaging them into an unnamed synthesis.
One substrate
One instant, observer, ephemeris, physical state, numerical policy, and provenance bundle feed both derived views.
Two namespaces
Signs, houses, rulers, techniques, rules, forecasts, and scores remain labelled by frame and tradition.
No tie-break by story
A known event, appealing narrative, or favorable chart cannot decide which frame the system reports.
Coordinates and geometry
3 comparisons
Zodiac zero points: equinox and Lahiri reference
The foundational comparison between an equinox-anchored tropical longitude and a Lahiri-sidereal longitude derived from the same celestial state.
One celestial direction, two sign labels
Why a planet can receive different sign and degree labels while its physical direction, distance, speed, and observation time remain unchanged.
Ascendant labels and whole-sign house geometry
How one horizon intersection can yield different ascendant signs and therefore different whole-sign house assignments under parallel zodiac frames.
Timing chronology
3 comparisons
Planetary ingress dates in tropical and sidereal frames
Why the same planet crosses tropical and Lahiri-sidereal sign boundaries on different dates and why neither timestamp may replace the other.
Retrograde motion and repeated boundary crossings
A frame-preserving chronology for direct ingress, retrograde re-entry, and final direct ingress without cherry-picking one crossing.
Transit windows and natal or event-chart contacts
How transit-to-chart contacts remain coherent when each model uses its own frame, natal features, orb policy, and exact-hit chronology.
Technique eligibility
3 comparisons
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.
Nakṣatra and lunar-mansion eligibility
Why Maha treats Lahiri nakṣatra placement as a sidereal technique input rather than retrofitting it onto an unlabeled tropical Moon.
Vimśottarī daśā eligibility and opening balance
Why the implemented Vimśottarī chronology belongs to a declared Lahiri-Jyotiṣa model and is not blended into tropical timing output.
Interpretation and evaluation
3 comparisons
Dignity, rulership, and house-lord disagreements
How changed sign labels and tradition-specific rulership schemes propagate into dignity, dispositors, house lords, and eligible interpretation rules.
Parallel frames for one corporate event
An evidence-bound corporate comparison that freezes one organization event before deriving separate tropical and Lahiri-sidereal chart views.
Prospective scoring without post-hoc frame selection
The empirical protocol required to compare tropical, Lahiri-sidereal, combined, and ordinary baselines without letting outcomes choose the winning system.