deterministic OCaml engine to compute and validate liturgical calendars for multiple rites, template-driven output to year 9999 https://git.labunix.xyz/colitur.git/atom?h=v1.2.0 2026-08-22T18:55:18Z 2026-08-22T18:55:18Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-22T18:55:18Z urn:sha1:9c96e0afc19925b651e0dfee3bc9182dee72acf0 Ascension has no octave under the 1960 rubrics -- confirmed structurally: the Proprium de Tempore's own table of contents runs straight from "In Ascensione Domini" to "Dominica post Ascensionem" with no per-feria headings in between. Step 3 of the reading chain therefore fell through to Preceding_sunday on every unoccupied weekday in that stretch, walking each one back to the 5th or 6th Sunday after Easter's own citation. The Missal's own Proprium de Tempore carries an explicit marginal rubric immediately after the Ascension's Mass propers, before "Dominica post Ascensionem" begins: "Diebus a feria VI post Ascensionem usque ad feriam VI ante vigiliam Pentecostes inclusive, dicitur Missa de festo Ascensionis, cum Gloria et praefatione de Ascensione, sine Credo et Communicantes proprio" -- every feria without its own proper, from the Friday after the Ascension through the Friday before the Vigil of Pentecost, repeats the Ascension's own Mass. RG 490(b) corroborates independently: it assigns the Ascension preface "tamquam de Tempore" across that identical window, which only makes sense if the Mass actually repeated there is the Ascension's, not a numbered Sunday's (whose own Mass would carry no need for a preface override at all). Witnessed directly, not only inferred from the rubric: the LMS Ordo prints "Mass of the Ascension" literally on every affected day across all three of its fixture windows, in BOTH the tail of Ascension's own week and the following week -- ruling out the alternative reading (that the second week instead resumes "Dominica post Ascensionem"'s own Mass, which a first pass over the FIUV Ordo's own week-labelled titles could suggest at a glance; its own [praef] field for the same two dates independently reads "Ascensionis", resolving the apparent conflict). Implemented as data, not logic, matching this codebase's own established precedent for the identical RG 299 shape (the week after Trinity Sunday, data/ef/lectionary.sexp's [trinity_week_entries]): six new hand-authored entries, [ascension_week_entries] in tools/bootstrap_lectionary.ml, regenerated against a git-pinned copy of lectio's own source ini (SHA-256 verified unchanged) so the regeneration carries no unrelated drift. The window's two Saturdays are deliberately excluded -- RG 78's votive Office of Our Lady on Saturday always wins an otherwise-unoccupied Class4 Saturday first, before step 2 (this fix's own entry point) is ever reached, so an entry for either slug would be dead data. Blast radius measured in-process across the full 1583-9999 domain (throwaway probe, not committed): 16 350 days total across the six slugs, every one resolved via step 2 (Own_slug), zero anomalies, and the window's two Saturdays confirmed to contribute zero hits via this cause across the whole domain, corroborating the RG78-interception reasoning by direct sweep. Closed L2 in data/ef/expected-divergences-lms.sexp. New cited entries: C41 in data/ef/expected-divergences.sexp (95 of 16801 rows, 2005-2050 -- lectio has no equivalent rubric and still walks these ferias back); M31 in data/ef/expected-divergences-missalemeum.sexp (3 rows in the 2026-2027 window, plus the same shape independently reconfirmed in the 2035 and 2038 live-capture windows) -- missalemeum, Divinum Officium's lineage, still gives the same wrong answer colitur itself used to give, which is why these rows used to agree with M18's shape and now escape it (M18 373 -> 370, the same mechanism M23-M27 established when the citation axis was first built). Golden pin: 2031-05-23, the exact date the bug report was filed against. Mutation-tested: reverting data/ef/lectionary.sexp alone (a git-diff capture/restore, not a source-code revert, since the fix is data) reddens 19 tests across the differential, both oracle fixtures, all three LMS Ordo windows, the golden pin, the lectionary unit test and every Render golden template; restored and reconfirmed green (681 tests; 683 under COLITUR_EXHAUSTIVE_SWEEP=1, ~175s). 2026-08-22T18:15:56Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-22T18:15:56Z urn:sha1:cd3e03bf3e5b040786838fc3c5639d7c29e9b3b8 Temporal_ef.temporal's Rogation Monday/Tuesday branch hardcoded Colour.Violet with no citation (data/ef/expected-divergences-lms.sexp's L6, surfaced by the LMS Ordo). RG 119 assigns white to the de-Tempore Office and Mass from the Paschal Vigil Mass to the Pentecost Vigil Mass exclusive; Easter+36/+37 sit inside that window. RG 128's own exhaustive four-case violet list never names Rogation days, and its vigil clause (d) is doubly inapplicable: these are not vigils, and they are inside Paschaltide, not outside it. RG 88 explains the violet actually seen in print sources: "de Litaniis minoribus nihil fit in Officio, sed tantum in Missa" -- the violet belongs to the Rogation Mass/procession, a distinct votive text this engine does not model, not to the day's own Office. Witnessed directly: LMS Ordo 2023-2024, 2024-05-06, "FERIA IV Cl W" with "Gl", the Office and Mass printed separately from the optional violet votive Mass of the Rogations. Cascade verified, not assumed: RG 432(b) omits the Gloria on every violet Mass, so the wrong colour was also silencing the Gloria on these two weekdays even though RG 237(e) (Breviary, ordinary Paschaltide ferias say Te Deum) already made it true underneath. White removes the 432(b) block, and the Gloria now follows Te Deum via 431(a), matching the Ordo's own "Gl" -- confirmed with dedicated golden pins in both test_golden.ml (colour) and test_rubrics_ef.ml (the Gloria flip), 2028-05-22/23 (neither day impeded that year). Closed L6 in data/ef/expected-divergences-lms.sexp. Reopened C8 in data/ef/expected-divergences.sexp (26 of 16801 rows, 2005-2050): lectio independently computes these two days violet too, so the two engines used to agree by sharing the same uncited assumption; colitur's colour is now correct and lectio's is not, so the comparator disagrees again, for the opposite reason. While reopening C8, found and corrected a genuine misattribution in its own prior closure note, which claimed lectio's violet was "RG 128(d)" -- 128(d) governs vigils outside Paschaltide and has nothing to do with Rogation days. Checked docs/research/rules-register.md for the same claim: not present there, but a related conflation was found and corrected at its O'Connell section 4(d) note, which had used a Rogation MASS/procession citation to "confirm" the day's own OFFICE colour. Blast radius measured in-process across the full 1583-9999 domain (throwaway probe, not committed): 4722 days total (2368 Rogation Mondays + 2354 Rogation Tuesdays actually observed outright, i.e. not impeded by a stronger sanctoral feast that year), all Violet->White, all with the Gloria flipping false->true alongside, zero anomalies. Mutation-tested: reverting the branch to Colour.Violet reddens 16 tests across Rubrics_ef, the lectio differential, the LMS Ordo suite and both golden pin files; restored and reconfirmed green (680 tests). 2026-08-22T14:40:24Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-22T14:40:07Z urn:sha1:60e87914718dd2c8e69bb89d8cc48d6bef9bfc74 The Missale Romanum's calendarium footnote for February (LT.txt:5011-5014, scan-corroborated scan2.txt:3050-3058): in a leap year the sixth kalends of March (24 February) is doubled rather than a 29th day appended, so St Matthias moves 24->25 February and St Gabriel of Our Lady of Sorrows 27->28, with 24 February itself carrying no fixed office that year. data/ef/expected-divergences-lms.sexp entry L3 tracked this as an open gap. Implemented as the rubric's own general mechanism (every fixed entry from 24 through 28 February shifts one civil day later in a leap year), not as "move these two named saints": the two readings are indistinguishable on shipped data (nothing else is fixed in that window) and diverge only for a future --overlay entry in the same range, which the mechanism reading covers correctly and a two-saints special case would not. This project has already been bitten once (RG 16(a)) by a rule implemented against shipped data's coincidental shape rather than the rubric itself. Kernel stays rite-agnostic: Rite.t gains a fixed_key field (Date.t -> (int * int) option), the same seam easter already establishes, read only by Layer.on_date's FIXED half -- the movable half (Easter_offset/Nth_weekday) is untouched. Default is the identity mapping, an optional argument on on_date, so every existing caller and every rite that supplies nothing is byte-identical to before this field existed. Date.is_leap is exposed in date.mli (already existed in date.ml) so the rite reads the kernel's own single-sourced leap-year definition. The EF implementation lives in Rite_ef.Temporal_ef.bissextile_fixed_key, fully cited, wired into Rite_ef.context. Blast radius, measured over the full 1583-9999 domain (Calendar.year run twice per civil year, real fixed_key vs identity, every day diffed): all 2,041 leap years in the domain show a visible change for each saint; 6,983 individual liturgical days change total, zero unclassified, across four shapes (Matthias vacates 24 Feb in 1,803 years / occupies 25 Feb in 1,811; Gabriel vacates 27 Feb in 1,699 / occupies 28 Feb in 1,670). L3's own prior estimate (1,650 years, observed-outright only) is confirmed close on the same definition (1,677 measured); the broader observed-or- commemorated count is higher, not lower, showing the narrow estimate undercounted visible impact rather than overcounting it. The lectio differential (2005-2050 fixture) gains a new cited entry, C40 in data/ef/expected-divergences.sexp: lectio implements no such shift, so every leap year in its window now diverges on the two shifted days (21 rows, not the naive 44 -- the comparator never compares commemorations, so a side where the shifted saint has zero comparator-visible footprint on both engines produces no row). The LMS Ordo's 2023-2024 fixture -- the window L3 was originally found in -- now matches on the Creed comparison; its formulary-override bucket count is corrected 182->181 (24 February leaves the counted Proper population, becoming Own_slug-sourced). The missalemeum oracle fixtures (2026-2027, 2038, 2035) cover no leap year and are unaffected. L3 is closed: converted from an active allow-list record to a prose closure paragraph (L1's own precedent), citation preserved verbatim, fix and measured blast radius recorded. The id-list assertion narrows to [L4] alone, and the now-dead "2024-02-24" -> "L3" date mapping is removed. Six golden values pinned across four new test cases: Matthias in a leap year (both the vacated and occupied sides) and a common-year control; Gabriel likewise, deliberately choosing a leap year where he is admitted only as an ordinary commemoration rather than winning outright, a different shape from Matthias's. Mutation-tested: forcing fixed_key back to identity reddens exactly five test cases -- the differential's Layer C count-pin (C40 drops to 0 actual vs 21 expected), the LMS Ordo's Creed and formulary-bucket checks, and both new golden pins -- confirming the tests actually exercise the fix. Reverted; dune test, the exhaustive sweep, and make check are all green. 2026-08-21T13:12:08Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-21T13:12:08Z urn:sha1:d129b9b9a766c3530d2dd6ac131ebafd1bddf7a5 The Latin Mass Society Ordo 2024-2025 for England and Wales (v2.21, compiled by Peter Day-Milne) gives 9 August 2025 as "OUR LADY on SATURDAY IV Cl W / V Mass of BVM / Commem of St Romanus M at Low Mass" -- no vigil -- and 10 August as the 9th Sunday after Pentecost with St Laurence commemorated. That is colitur's output on both days, field for field. It is discriminating where the Ordo already in docs/research was not. This edition lists six vigils as the day's office across its year, including the Assumption's on 14 August 2025, and its footnotes discuss arranging a diocesan feast around the Vigil of St Laurence in other years. Its absence on 9 August 2025 is an application of the rule, not a data gap. The extraordinaryform.org Ordo omits that vigil on every date it covers, including 2027-08-09 where the clause says to keep it, which is why it witnesses nothing here. Also confirms the Vigil of the Assumption as II Cl violet, the RG 128 colour this project corrected from the bootstrap's White. The clause's other shape -- feast transferred away, 2022/2033/2038/2044 -- remains unwitnessed; no accessible Ordo covers those years. Stated in the note rather than left implied. 2026-08-21T13:04:52Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-21T13:04:52Z urn:sha1:f3ac69d0a679200a48716be065a0fa2e70a2c6da Replaces the withdrawn Ordo claim with a real one of a different kind. O'Connell, The Celebration of Mass (4th ed., 1964) -- a rubrics commentary contemporary with the 1960 Code, outside the Divinum Officium -> missalemeum -> lectio lineage, already cited here for RG 128 -- states all three of RG 33's triggers in English, the third included, verbatim in substance with the Latin. The same passage confirms vigil_feast_table's membership independently: Christmas Eve and Pentecost I class and so outside the rule; Ascension, Assumption, John the Baptist and Peter & Paul II class; St Lawrence the sole III-class vigil. Five entries, the same five, same class split. It confirms the RULE and the ENTITY LIST, not the 10 days -- O'Connell publishes no day-by-day calendar. The distinction is stated in the note rather than blurred, since blurring it is what the withdrawn Ordo paragraph did. 2026-08-21T13:00:03Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-21T13:00:03Z urn:sha1:afd82f97ff440add51ea3e87c7ab53938443d5a0 C39 and the 2025 golden pin both claimed the published Ordo independently confirms RG 33's third trigger, because it omits St Lawrence's vigil on 2025-08-09 where lectio and missalemeum keep it. It does not. The Ordo omits that vigil on 2027-08-09 as well, where the clause says to keep it (10 August is a Tuesday, the feast holds its day), and 2026-08-09 is a Sunday where the rule's first trigger omits it anyway. The 2024 date has no row. So the Ordo never shows St Lawrence's vigil on any date it covers, and the 2025 agreement is a blanket gap coinciding with the right answer, not evidence. The rule itself is unaffected: it rests on RG 33's text, which admits no latitude, and on lectio not evaluating the clause at all -- "RG 33" appears nowhere in its production code, and the third trigger cannot emerge from per-day rank comparison because it turns on what is observed the following day. The divergence is architectural, not a disagreement about the rubric. Recorded rather than deleted: the withdrawn claim is why this entry was first written up as unusually well corroborated. 2026-08-21T12:46:34Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-21T12:46:34Z urn:sha1:8072287da9d8e8a9e2de8b7845923f5d576dea55 The note apportioned the entry's ten rows as seven commemoration-reduced and three transferred, counting 2038-06-23 in both halves to make the arithmetic work. It is six and four; the row count itself was always right, and is pinned by the comparator. 2026-08-21T12:42:30Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-21T12:42:30Z urn:sha1:12b97761019cfa02ca0da8a5fb50ef815d07685c RG 33 omits a II/III-class vigil in three cases: it falls on a Sunday, it falls on a I-class feast, "vel si festum cui praemittitur in alium diem transferri aut ad commemorationem reduci contingat". Only the first two were built; the third was recorded in precedence_ef.ml as unimplemented on the grounds that no witness existed in the shipped data. That reasoning was wrong, and the rule fires on 1 744 days across 1583-9999. Both halves of the clause reduce to one observable question -- is the feast the OBSERVED office on the following day (RG 34 puts it there) -- so the kernel asks it once per candidate, after place_transfers has settled the year. No fixed point is needed: a vigil is a candidate only on its own day, never on its feast's, so suppressing it cannot change what the next day observes. Precedence.rules gains vigil_feast, which returns the slug of the feast a vigil precedes; the kernel cannot infer that itself, because only two of the five vigil/feast pairs share a slug stem. Blast radius, measured pre-change binary vs HEAD over the whole domain and classified: 1 744 days, three shapes, zero unexplained. 1 199 are the feast reduced to a commemoration (10 August on a Sunday, St Lawrence); 478 and 67 are the feast transferred under RG 96 after the Sacred Heart or Corpus Christi takes its day. The Assumption's and the Ascension's vigils never qualify -- their I-class feasts always keep their own day. Independently witnessed, which is unusual here. The published Ordo -- the only witness outside the Divinum Officium -> missalemeum -> lectio lineage -- omits St Lawrence's vigil on 2025-08-09, agreeing with colitur against both engines. That date had been read earlier as an Ordo gap; the Ordo was right, and correcting the misreading is what surfaced this clause. On 2027-08-09 the feast does keep its day and the Ordo omits a vigil colitur correctly keeps, which is a genuine Ordo gap. Allow-lists: C39 (lectio, 10 rows) and a 2038 oracle class citing the register, the 2026-2027 window having no instance. The golden pin asserting St Lawrence's vigil is violet moved 2025 -> 2027; its own comment had reasoned about the vigil's weekday and missed that RG 33 also looks at the feast's. Two new pins cover both shapes of the clause. The vigil/feast table is built with Slug.of_string_exn: mutation testing showed that of_string plus Result.to_option turns a typo into None, which this hook's contract reads as "not a vigil", switching the rule off in silence. Two tests assert the table against the shipped data in both directions. 2026-08-18T15:35:53Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-18T15:35:53Z urn:sha1:897c274fd28402159ca6d45eedc1257b1ce98696 lectio adopted the last two Missal corrections colitur argued: C14 3 -> 0 RG 96(a)/97/98. lectio resolved each impeded I-class feast's transfer independently, so in 2008, 2035 and 2046 St Joseph and the Annunciation both walked onto the Monday after Low Sunday and Joseph, losing there, was observed on no day of those years at all. It now resolves the year's transfers as a set: the Annunciation takes the Monday as its sedes propria, Joseph the Tuesday. C15 7 -> 0 The Holy Family propers' own 13-January rubric, "sine commemoratione Baptismatis D.N.I.C.". lectio kept the Baptism as the observed office on all seven such years in 2005-2050. Those were the last two BEHAVIOUR classes. What is left is C1 (138) and C6 (119), both pure slug vocabulary. Measured across the whole fixture, applying only the season normalisation the test already applies: 579 of 16801 days differ, and every one of them differs on the SLUG ALONE. Zero days differ on season, rank, colour, Epistle or Gospel. (The test's own norm_slug table already maps 322 of the 579; the 257 left are C1 and C6. The field profile is the same either way.) So the two engines now agree on every liturgically meaningful field on every day of 2005-2050. The residue is what the two projects call things -- ef-christmas-2-friday against ef-time-after-epiphany-1-friday for the same day, same Mass. Aligning it means renaming lectio's slugs, and those are keys: its lectionary, clectio's generated tables and any user overlay are built on them. Left as vocabulary rather than forced. Fixture refreshed against lectio e713da2; 13 rows changed, colitur agrees with all of them. 24 divergence classes at the start of this work, 2 now. 2026-08-18T15:18:16Z Lukasz Kasprzak lukas@labunix.xyz 2026-08-18T15:18:16Z urn:sha1:5773d603a2936638654f8e6bd8e595240de4203a The ferias between Epiphany and the first Sunday after it repeat Epiphany's own Mass in lectio now; they had been taking the Mass of the Sunday that follows them. C31 98 -> 0 C1 40 -> 138 grew, and changed character C1 is now SLUG VOCABULARY ONLY, and its note says so. Season, rank, colour and both citations agree with colitur on every day of the January window; what differs is the identifier -- ef-christmas-2-thursday against ef-time-after-epiphany-1-thursday for the same day with the same Mass. C6 is the same shape. That is 257 of the 267 remaining rows. Aligning the vocabularies would mean renaming lectio's slugs, and those are keys: its own lectionary, clectio's generated tables and any user overlay are built on them. Recorded as vocabulary rather than closed, because the rows do differ -- just not in anything a reader of either engine's output sees. Measured for 2026: season, rank and colour agree on all 365 days; 14 days differ and every one differs on the slug alone. 5 classes -> 4, agreement 98.4%.