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.
Frame comparison · released 2026-08-18
Shared fact substrate
The Moon’s instant, apparent longitude, speed, and angular separation from the Sun are shared celestial facts before mansion labels are applied.
Required shared inputs
- Moon tropical longitude
- Named ayanāṁśa
- Sidereal Moon longitude
- 27-fold mansion segmentation
- Boundary-distance tolerance
Tropical view
A tropical chart can retain Moon longitude and phase without automatically receiving a Jyotiṣa nakṣatra interpretation. Tropical lunar-mansion methods require their own named convention.
Lahiri-sidereal view
The Lahiri-sidereal Moon is segmented into 27 equal nakṣatras and padas under the declared Jyotiṣa calculation contract.
Where they agree
Both views can consume the same Moon observation and numerical precision. Neither gains additional astronomical evidence from a traditional mansion name.
Where they disagree
Technique eligibility differs: a Jyotiṣa nakṣatra rule consumes the sidereal Moon, while an unrelated tropical rule cannot claim the same placement without declaring a separate system.
Preservation policy
Keep phase geometry in the fact layer and store nakṣatra, pada, ruler, boundary distance, and rule matches only in the declared sidereal technique namespace.
Prohibited synthesis
Do not combine a tropical Moon sign with a Lahiri nakṣatra as if the pair came from one unnamed classical system, unless a registered synthesis explicitly says so.
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.
- Lahiri ayanāṁśa calculations
Maha Celestial
Maha’s declared transformation from retained tropical longitude to a separate Lahiri-sidereal longitude.
Boundary: Selecting Lahiri defines one sidereal convention; it does not establish that sidereal astrology is superior or empirically valid.
- 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.