From ce67fad69398047739a6ce89fb76f32b136b69f5 Mon Sep 17 00:00:00 2001 From: Lukasz Kasprzak Date: Tue, 25 Aug 2026 19:59:26 +0200 Subject: fix(of): correct vigil_feast's justification for of-nativity-vigil The prior comment claimed of-nativity-vigil is 'not a distinct celebration' - wrong: Temporal_of.named (temporal_of.ml:230) constructs it as its own Sollemnitas-rank candidate on 24 December, a genuine contestant in band/Precedence.resolve. The real reason None is safe is structural, not that. The Nativity is Tabula entry 2 (band 20); only entry 1, the Paschal Triduum (band 10), bands lower. The Triduum's Easter-2..Easter window is confined to 20 March-25 April because Gregorian Easter never falls outside [22 March, 25 April] over the whole 1583-9999 domain (measured exhaustively in test_computus.ml, not assumed), so it can never reach 25 December. The Nativity therefore always keeps its own day and its vigil can never be orphaned by a transfer or reduction. Behaviour is unchanged: vigil_feast still returns None unconditionally. RG 33 (EF-only) and Normae nn. 11/13 remain the reason the hook exists at all and returns None for every other candidate. --- lib/rites/rite_of/precedence_of.mli | 15 ++++++++++++--- 1 file changed, 12 insertions(+), 3 deletions(-) (limited to 'lib/rites/rite_of/precedence_of.mli') diff --git a/lib/rites/rite_of/precedence_of.mli b/lib/rites/rite_of/precedence_of.mli index 6b30dad..e81d35e 100644 --- a/lib/rites/rite_of/precedence_of.mli +++ b/lib/rites/rite_of/precedence_of.mli @@ -69,9 +69,18 @@ val admit : (Vocab_of.rank Precedence.candidate * Precedence.privilege) list (** [vigil_feast]: always [None]. RG 33's third omission trigger is EF-only; - the OF has no vigil OFFICE that its feast's movement could orphan. The - Nativity's "of-nativity-vigil" is a Mass formulary of the solemnity, not a - separate celebration. *) + the OF has no vigil OFFICE that its feast's movement could orphan -- + Normae nn. 11/13 create no such independent celebration for anything + other than "of-nativity-vigil". THAT candidate is not exempt by lacking + standing: {!Rite_of.Temporal_of.named} constructs it as its own + Sollemnitas-rank candidate on 24 December, a genuine contestant in + {!band}/{!Colitur_kernel.Precedence.resolve}. It is exempt structurally + instead -- the Nativity (Tabula entry 2, band 20) can only ever be beaten + by the Triduum (entry 1, band 10), whose window (Easter-2..Easter) is + confined to 20 March-25 April because Gregorian Easter never falls outside + [22 March, 25 April] (measured exhaustively, 1583-9999, not assumed), so + it can never reach 25 December. The Nativity therefore always keeps its + own day, and its vigil can never be orphaned. *) val vigil_feast : Vocab_of.rank Precedence.candidate -> Slug.t option (** The four functions assembled for {!Colitur_kernel.Precedence.resolve}. *) -- cgit v1.3