VED-010: Muhurta Lagna, strength and Navamsa source record

Date: 9 October 2026. Baseline: engine 571788a1fe705b096d5a69911f30be583c7c45d7, wiki ed68937510e6ce162da82420b4f42415c0480161, version 6.9.9. The user authorized publishing VED-009 and then implementing VED-010. VED-011 complete purpose elections remain a separate package.

1. Source witnesses and reproducibility

Private scans, rendered pages, source manifest and execution receipts are in C:/dev/outputs/ved010-research-2026-10-09/. Books are not redistributed. Public fixtures contain independently transcribed factual tables and worked examples, with derived test cases distinguished from printed examples.

Witness	Inspected locus	Role
Daivajna Rama, Muhurta Chintamani, Ramlal Avasthi Hindi commentary, Chandika Prasad Avasthi editor, Tejkumar Book Depot, tenth edition 2004; primary scan	Nakshatra 44, printed 46 / PDF 55; Vivaha 75-78, printed 140-143 / PDF 149-152; 84-92, printed 145-148 / PDF 154-157	Governing purpose, quarter-aspect, Navamsa, placement-score and selected exception rules; Sanskrit, anvaya and commentary visually inspected.
Brihat Parashara Hora Shastra, R. Santhanam I; local C:/dev/ASTROLOGY-BOOKS-DATABASE/Classics books/BPHS-Santhanam-Vol-1.pdf	3.11, printed 27-28 / PDF 26-27; 3.55 table, printed 40 / PDF39; 6.12, printed72 / PDF71; dignity discussion printed39 / PDF38	Explicit nature interpretation, complete directional natural-relationship table and D9 partition authority. Printing identified by hash; no unverified date assigned.
N.P. Subramania Iyer, Kalaprakasika, AES1982; primary scan	Printed195-199 / PDF232-236	Collation of stronger/broader exceptions. Distinguishes rising-sign Tyajya from the stellar Tyajya admitted by VED-009.
B.V. Raman, Bhava and Graha Balas, 1996; local Books by Authors/BV Raman/Bhava and Graha Balas 1996.pdf	Printed109 / PDF114, minimum-strength table, visually inspected	Independent threshold witness. It prints Sun 300 shashtiamsas, unlike the current canonical Shadbala owner's 390. This is a recorded discrepancy, not silently substituted into Muhurta.
B.V. Raman, Muhurtha, online reflowed transcription; file	PDF21-23	Corroboration and differing language about sixth Venus/eighth Mars; edition not established, so it does not override the inspected MC verse88.

Online discovery also examined the BharatKosha transcription of MC's Vivaha passages. Its chapter navigation/metadata does not control edition attribution; the locally inspected scan does. No secondary software is runtime authority. The local database search found the BPHS and Balas witnesses; absence of an additional matching filename does not establish absence of classical support.

Witness	SHA-256
MC	9e931eb7fdc1958516424590a168680be60753f4cfccea8f327cae973dfe4777
BPHS I	13609f1af89541e070c798b8c70c6bfd74a8b9a71a71388913bf898e9f9ddf3f
KP	d082d5b3b29cb6c054f3cfe8e5ff50dfa6a66220128b52afa485c5a91c10c074
Balas1996	727c8063f64816a0c1c7f6bc577c249629854e980bf860bf4cfd8de16ec9bab2
Raman transcription	8ab2c1fc0a4ca0e0f7145434b4c02f8efa97ce48d27fc03732cd632d6a3f9256

2. Finite purpose profiles

mc_nakshatra_44.v1 evaluates four independent requirements: empty eighth and twelfth houses; election Lagna in3/6/10/11 from either supplied natal Moon or natal Lagna; benefic occupancy/aspect of Lagna; Moon in3/6/10/11 from Lagna. Missing references remain unknown. Every house is a whole sign counted from the sidereal rising sign. This is a general Lagna component, not all auspicious undertaking requirements.

mc_vivaha_75_78_84_88_92.v1 evaluates the finite marriage components below. The general profile allows Moon in the sixth while the marriage placement profile restricts it. These source-specific rules are therefore not merged. Neither profile declares an entire activity suitable.

3. Navamsa and aspect choices

MC 84 lists Sagittarius, Libra, Virgo and Gemini; Pisces is optional in the verse, while Avasthi reports an older rejection. Both readings are named: mc_avasthi_vivaha_84_four.v1 (default) and mc_vivaha_84_optional_pisces.v1. MC 85 separately excludes the ninth Navamsa unless vargottama, and the combination of movable Lagna/movable Navamsa with Moon in Libra or Capricorn. The Aries/Sagittarius and Taurus/Virgo last-segment examples are printed examples; the Gemini/Gemini exception fixture is derived.

MC 75 assigns all planets quarter aspects to3/10, half to5/9, three-quarter to4/8 and full to7, with Saturn3/10, Jupiter5/9 and Mars4/8 full. Any positive share counts in the selected support tests. MC 76's printed Mercury and Jupiter examples explicitly use partial aspects. D1 planet positions are compared to D1 and D9 sign labels; D9 planetary positions are not substituted.

MC 76 permits the D9 lord to occupy or aspect either target. MC 77 permits the pair of own-target aspects or the pair of cross-target aspects, without adding occupancy to that verse. Both apply separately to Lagna and seventh targets. MC 78 uses an aspecting benefic who is a friend of the corresponding D9 lord. The declared direction is D9 lord toward the potential supporting planet, using BPHS natural friendship rather than temporary/compound friendship. The general profile explicitly composes MC 44 with this MC 75 aspect convention. These are named interpretations, not a claim that every aspect school agrees.

The nature convention uses BPHS 3.11's verse: Sun/Mars/Saturn/nodes malefic, Jupiter/Venus benefic, waxing Moon benefic, Mercury malefic when associated with a malefic. Operational boundaries are declared: waxing is elongation 0 < Moon-Sun <=180; association is the same D1 sign. Santhanam's further commentary alternatives (waning-Moon benefic association, paired Moon/Mercury, and Yavana phase-strength regions) are not silently included. Missing Mercury association evidence remains unknown where it could change the result.

4. Lagna Vimshopaka is not Shadbala or Varga Vimshopaka

MC 87 supplies the favorable houses; MC 92 supplies weights:

Planet	Favorable houses	Weight
Sun	3,6,8,11	3.5
Moon	2,3,11	5
Mars	3,6,11	1.5
Mercury, Jupiter	1,2,3,4,5,6,9,10,11	2,3 respectively
Venus	1,2,4,5,9,10,11	2
Saturn, Rahu, Ketu	3,6,8,11	1.5 each

These nominal weights sum to 21.5, but the favorable-house set never includes an opposite pair. The nodes are antipodal, so at most one contributes: the attainable maximum is 20. Direct inputs reject inconsistent node geometry, including nearly opposite angles that fall into non-opposite signs. Each planet's full weight is awarded in its listed houses and zero elsewhere; missing inputs remain null. The total is null until all nine placements and Lagna are supplied; known contributions remain visible without renormalizing.

Avasthi's commentary gives less than 5 prohibited,5-10 inauspicious,10-15 middling and 15-20 auspicious. At10 and 15 both adjacent bands are retained. This avoids inventing a non-overlapping endpoint convention absent from the wording. These source labels concern this component only.

5. Placement restrictions and bounded exceptions

MC 86 is encoded by planet and prohibited house: Saturn 12, Mars 10, Venus 3, Moon and malefics1; Lagna lord/Venus/Moon 6; Moon/Lagna lord/benefics/Mars 8; all planets7. Moon 12 is additionally witnessed by88. Role predicates, position evidence, raw detection and exception evidence remain separate.

Optional mc_vivaha_88_natural_avasthas_orb.v1 admits:

• Venus 6: enemy sign or debilitated sign.
• Mars 8: enemy sign, debilitated sign or combustion.
• Moon 6/8/12: debilitated sign or debilitated Navamsa.

Enemy means the existing BPHS natural relationship from planet to sign lord. Mars combustion reuses moira.avasthas._is_combust, with the explicit numerical policy of shortest solar elongation strictly less than 17 degrees. MC 88 says combust but does not specify this orb; the orb is declared composition policy, not attributed to its verse. No retrograde-orb variant is relevant for Mars. A missing Sun is unknown for combustion unless another sufficient exception is already established. Exceptions are off by default and never delete the raw restriction. They do not cancel the distinct VED-009 temporal detectors.

The Kartari part of88 needs its own detector and source-treatment of the commentary ambiguity; it is not inferred from these placement checks. Broad 89-91 remedies, KP's differing dignity/aspect remedies and rising-sign Tyajya are explicitly excluded. Source availability is established; universal scope and automatic cross-source application are not.

6. Shared-owner corrections justified by this audit

BPHS 6.12's3-degree20-minute divisions require exact rational boundaries. Floor division by the rounded float 30/9 misassigned exact10/30-degree inputs to the preceding Navamsa. The shared Varga owner now partitions the supplied binary angle against rational10/3 using integer ratios. The generic D9 call, named Navamsa, sign-index accessor, Shadbala parity share and Avastha D9 helper agree. Tests independently use Fraction at all 109 zodiac endpoints and both neighboring floats. Other Varga methods are unchanged.

BPHS 3.55's visibly inspected table places Moon among Venus's enemies; the existing table incorrectly placed it among neutrals. Its defining rule also yields this result: Cancer is tenth from Venus's Libra mulatrikona. The shared dignity owner is corrected, with all 42 directional relationships pinned in a source fixture. The reverse Moon-to-Venus relation remains neutral. This affects dignity in Cancer, compound relations and their existing Varga, Shadbala, Avastha and yoga consumers. It is disclosed as a compatibility change, not hidden in a new local copy of the relationship table.

7. Shadbala evidence and astronomical composition

A supplied ShadbalaResult must have the same UT1 epoch and named ayanamsa, all seven planets, finite components, canonical thresholds, consistent component/grand totals and sufficiency. The result stores immutable per-planet vessels, preserving the full breakdown. Caller-supplied data is not certified as ephemeris-derived just because its arithmetic is consistent.

Dated composition uses the serving reader, resolved UT1/TT/TDB, apparent geocentric true-ecliptic-of-date longitudes, true ayanamsa, true geometric nodes and canonical house-owner Ascendant. Polar/degenerate Lagna stays unavailable. Optional Shadbala uses its existing owner with Porphyry houses, JD weekday, geometric day/night, actual speeds/latitudes and optional explicit hora lord. No hora contribution is invented when the caller omits it. This is an instantaneous product; it does not guarantee duration or solve continuous strength thresholds. The source disagreement in the Raman minimum strength table is retained; this package does not revise Shadbala's thresholds or pretend that its sufficiency boolean is a classical Muhurta cancellation.

8. Delivery and admission gates

The implementation spans the engine, eleven curated exports, three facade methods and three strict REST routes. Verification requires source tables, printed examples, exact/adjacent boundaries, partial truth, opt-in exception scope, malformed input rejection, canonical serialization, real-reader lifecycle/HTTP parity, shared-owner regressions and release artifact checks. See the standard and execution receipt. This closes the selected VED-010 composition package; complete purpose-policy coverage remains VED-011, with named exclusions available for subsequent scope.