A commemoration that only exists because Vespers/Compline crossed a day
boundary now renders as "(of today)"/"(of tomorrow)" in English and the
real Divino Afflatu "de præcedenti"/"de sequenti" in Latin, instead of
showing silently with no indication it's a cross-day artifact.
Also adds forbidsSuccessorCommemoration to SaintRecord and
TemporalFeastRecord: a feast can now refuse to commemorate whatever wins
the next day at its own kept Second Vespers, the feast-side mirror of the
day-side privilege calendar/commemorations.ts already modeled. Left unset
everywhere for now (a no-op) -- it exists so the next commit's Sacred
Heart record has somewhere to carry the real, live-sourced exclusion
against Most Precious Blood.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014axryJBrRswYh2niA7WCUc
User-reported: 2026-08-24 Vespers (St. Bartholomew, Duplex II. classis,
keeps his own evening) should have commemorated 2026-08-25's St. Louis
(Simplex), but didn't. This was the exact untested asymmetry the old
commemorationOf's own doc comment flagged as "inferred by symmetry, not
independently live-verified." Live-verifying now shows the two
directions genuinely differ: a Simplex predecessor losing to tomorrow's
First Vespers is correctly excluded (Aug 7 Donatus case, "nihil de
præcedenti"), but a Simplex successor displaced because today keeps its
own Vespers IS still commemorated (Aug 24->25, "commemoratio de
sequenti").
Split the one shared commemorationOf into
commemorationOfDisplacedPredecessor (keeps the Simplex exclusion) and
commemorationOfDisplacedSuccessor (drops it).
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014axryJBrRswYh2niA7WCUc
hasFirstVespers() required Semiduplex-or-higher, so a bare Simplex
feast could never anticipate the evening before it. Live-verified
this was too strict: St. Zephyrinus (Aug 26, plain Simplex) claims
First Vespers over St. Louis (Aug 25, also Simplex) in the reference
engine -- "Vespera de sequenti; nihil de præcedenti." A Simplex feast
has no Second Vespers of its own, but it does still get First Vespers;
there's no rank floor at all, only keepsOwnSecondVespers' separate
question of whether the preceding day outranks the claim.
This also surfaces St. Zephyrinus's Magnificat antiphon, which now
actually gets used (St. Louis, previously shown by the old bug, is
permanently boxed out of ever governing real Vespers in this merged
calendar -- Bartholomew outranks him the evening before, Zephyrinus
the evening after, every year -- so his own Magnificat antiphon was
never authored). Added st-zephyrinus-magnificat-antiphon.yml, live-
verified bilingual text ("Iste Sanctus...").
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_014axryJBrRswYh2niA7WCUc
At Vespers/Compline, a day's own Vigil losing tonight to tomorrow's First
Vespers was showing up as a redundant extra commemoration alongside that
same feast (e.g. Nov 29's Compline showing both "St. Andrew" and "Vigil
of St. Andrew" for Advent I's anticipated evening).
Added an explicit `vigilOf` field to each Vigil's own saint record
(several Vigil ids don't map cleanly to their feast's id by stripping a
`vigil-of-` prefix — `vigil-of-the-assumption` vs `assumption`,
`vigil-of-st-james` vs `st-james-the-greater` — so this needs to be
explicit rather than guessed from the id or date adjacency).
calendar/vespers.ts's evening-anticipation merge now skips adding the
Vigil commemoration when tomorrow's winner or its own commemorations
already include that same feast.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Whichever of today/tomorrow doesn't govern a given evening's Vespers
can still be commemorated there, unless it's Simplex (or a bare
temporal winner with no standing of its own) — live-verified in both
directions against the real Monastic 1617 engine: Ss. Cyriacus/Largus/
Smaragdus (Semiduplex) commemorated when Sunday claims First Vespers
over them; St. Anne commemorated even though St. James (Duplex II.
classis) keeps his own Second Vespers outright; St. Donatus (Simplex)
gets nothing ("nihil de præcedenti") in the same situation Cyriacus/
etc. did get a commemoration. The isMajorFixedFeastOfTheLord override
(Christmas/Epiphany/Candlemas/Easter/Ascension/Corpus Christi/Sacred
Heart) deliberately doesn't inherit this yet — no live data on whether
those suppress it the way privileged-sunday/privileged-feria-major do
during the day.
Also fixes hasFirstVespers's threshold, found wrong while gathering
the above evidence: it required duplex-majus+, but Ss. Cyriacus/etc.
(plain Semiduplex) actually claims First Vespers over St. Donatus in
the live engine. Lowered to semiduplex, matching the sibling
privileged-feria-minor threshold already used just below it.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Found while starting the December sanctoral pull: Advent's plain
(non-Ember) weekday ferias have real standing in the live Monastic 1617
engine that the existing ordinary-feria category couldn't represent --
a Simplex saint (St. Bibiana, Dec 2) is merely commemorated there rather
than winning outright, while a Semiduplex+ saint (St. Nicholas, Dec 6)
wins with the feria itself commemorated back. Adds a third, weaker
privileged-feria-minor tier (Semiduplex+ threshold, vs. privileged-
feria's Duplex+) rather than reusing either existing tier, mirroring how
privileged-feria/privileged-feria-major were split in March. Lent's own
ordinary ferias likely share this property but are left as-is, unverified
this session.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
A plain Duplex saint was losing to any privileged feria (Ember days
included) since the occurrence engine only let duplex-1-classis+ get
even a commemoration there. Verified this was wrong: St. Gregory the
Great, plain Duplex, outright wins against a Lenten Ember Saturday in
the real Monastic 1617 engine.
Splits TemporalCategory's single privileged-feria into privileged-feria
(the lesser tier — Lent's Ember days, verified — now behaves like an
ordinary Sunday: Duplex+ wins outright) and privileged-feria-major (Ash
Wednesday, Holy Week, the Easter Octave, verified via St. Mark only ever
being commemorated there, never winning — behaves like privileged-
Sunday). Everywhere else the old single category was ambiguous
(Pentecost's own Ember days/Vigil/Octave, the Vigil of Christmas)
defaults to the stricter major tier pending verification.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Corrects and completes the occurrence rules, based on a design discussion
plus one concrete data point: St. Anthony Abbot (plain Duplex) was found
outright winning against an ordinary Sunday in the real Monastic 1617
engine, which the old duplex-1-classis-only threshold got wrong.
- FeastClass gains `vigil`, inserted between `simplex` and `semiduplex` —
one ordering that correctly serves both "does this win against a Sunday"
(vigil behaves like simplex there) and "which of two saints wins a
landing-day collision" (vigil beats simplex, loses to semiduplex).
- LiturgicalDay.occurring (a flat OccurringFeast[] that could only ever
express a losing *sanctoral* candidate) is replaced by `winner:
DayWinner` + `commemorations: Commemoration[]` — a discriminated list
that can hold the temporal day itself, one or more sanctoral entries, or
(not built yet, but the shape already accommodates it) a future octave
kind.
- commemorations.ts: ordinary Sundays let Duplex+ win outright (Sunday
commemorated in return), Semiduplex/Vigil transfer elsewhere (too
substantial a feast to cheapen with a bare commemoration), Simplex stays
and is commemorated. Privileged Sundays never displace; Duplex-majus+
commemorated, everything else transfers.
- collision.ts (new): resolves two sanctoral candidates wanting the same
day (a transfer landing on an already-occupied day, or two native
saints sharing a date) — duplex > semiduplex > vigil > simplex, loser
always commemorated, ties favor the native occupant.
- temporal-id.ts (new): maps any date to one of the 52 real Sunday-collect
ids from the previous commit, so a temporal winner/commemoration can
actually be looked up, not just labeled "temporal" in the abstract.
- index.ts's resolveDay orchestrates all of it, including the actual
Monday/Saturday transfer mechanism. Landing on a privileged feria (the
concrete case: Holy Week, right after Palm Sunday) is explicitly
deferred rather than guessed at — it needs its own Easter-keyed lookup
table, the same way the reference engine handles it.
Added the Vigil of St. Lawrence (Aug 9) as real content specifically to
exercise the backward-transfer rule end-to-end: Aug 9, 2026 is a Sunday,
so the vigil transfers cleanly back to Saturday, verified by a new
integration test alongside the unit-level rule and collision tests.
Compline (and eventually Vespers) now resolves off whichever day's
identity actually governs tonight's office, not always today's — real
practice anticipates a higher-ranking tomorrow (Alma Redemptoris Mater
starting the Saturday evening before Advent I, Ave Regina Caelorum
starting the eve of Candlemas, Regina Caeli starting at the Easter
Vigil), which the previous date-only resolution missed entirely.
calendar/vespers.ts's resolveEveningDay compares today's and tomorrow's
precedence (reusing commemorations.ts's FeastClass machinery) to decide.
One deliberate absolute exception, caught by a failing test: a short,
explicit list of supreme fixed/movable feasts (Easter, Christmas,
Epiphany, Candlemas, Ascension, Corpus Christi, Sacred Heart) always wins
tomorrow's Vespers before checking whether today would otherwise keep its
own — without it, Holy Saturday's privileged-feria status incorrectly
blocked Easter's anticipation, the textbook case this whole thing exists
to get right.
hours/compline.ts now resolves its whole ordo through resolveEveningDay
instead of resolveDay.
will