How the work is done
One chart, five rule sets, every difference named
We separate the astronomical calculation from the interpretive rule set. Every methodology receives the same chart inputs; each then applies its own documented scoring tables, house lists, cancellations and vetoes.
What stays the same
Date, recorded time, place and coordinates produce one sidereal chart using the Lahiri ayanamsa. Planetary positions, the Moon’s nakshatra and pada, signs and houses are computed once. The matching profiles do not get different planets.
Birth time is never silently invented for a time-dependent calculation. Tools that can work from selected nakshatras say so; the sensitivity tool tests defined offsets when a recorded time is uncertain.
What changes between methodologies
The five profiles represent North Indian practice, B. V. Raman’s southern treatment, Drik Panchang, Astro-Vision and Kerala practice. They can differ on the koota table, directional reading, Mangal-dosha reference points, cancellation scope and whether a rule can veto an otherwise acceptable total.
All five currently use the same Lahiri chart so their rule differences can be compared on one astronomical base. B. V. Raman’s published approach specifies Raman ayanamsa; that astronomical divergence is not yet modelled here, so the Raman profile means his matching rules applied to the shared Lahiri chart.
We do not average those differences into a sixth answer. Each result names the convention that produced it and shows disagreement rather than hiding it inside one total. The longer background is in the five traditions of kundli matching.
What the output can and cannot claim
The system reports what the selected documented rule sets conclude. It does not predict whether a marriage will be happy, rank one regional tradition above another or sell a remedy for a result. A calculation can be reproducible without making the underlying astrological claim scientific fact.
How to inspect the work
Tool results expose the convention and applicable sourced rules. The source policy explains how evidence is labelled; the corrections record explains how errors are disclosed. The open score dataset publishes the complete distribution behind the score reference pages. A complete sample report is available before payment, and the verification page describes the reproducibility checks.