diff options
Diffstat (limited to 'internal/calendar/temporal_ef.go')
| -rw-r--r-- | internal/calendar/temporal_ef.go | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/internal/calendar/temporal_ef.go b/internal/calendar/temporal_ef.go index 6828f35..0cd4b41 100644 --- a/internal/calendar/temporal_ef.go +++ b/internal/calendar/temporal_ef.go @@ -159,6 +159,23 @@ func temporalEF(date time.Time) temporalDay { return efCel(Christmas, "ef-nativity", White, RankClass1, 0) case date.Month() == time.January && date.Day() == 1: return efCel(Christmas, "ef-circumcision", White, RankClass1, 0) + // RG 17(a): "festum Ss.mi Nominis Iesu, celebrandum dominica quae occurrit + // a die 2 ad 5 ianuarii, secus die 2 ianuarii" -- the Most Holy Name of + // Jesus is kept on the Sunday falling 2-5 January, and when no Sunday falls + // in that window, on 2 January instead. + // + // The fallback is not decoration: the window is four days wide, so in + // roughly three years in seven no Sunday lands in it and 2 January carries + // the feast. Without the fallback lectio simply had no Holy Name office at + // all in those years. + // + // Placed before the Epiphany case below and after the Circumcision above, + // so 1 January keeps its own feast and 6 January keeps Epiphany. + case date.Month() == time.January && date.Day() >= 2 && date.Day() <= 5 && + date.Weekday() == time.Sunday: + return efCel(Christmas, "ef-holy-name-sunday", White, RankClass2, 0) + case date.Month() == time.January && date.Day() == 2 && !sundayFallsJan2to5(y): + return efCel(Christmas, "ef-holy-name", White, RankClass2, 0) case date.Month() == time.January && date.Day() == 6: // Christmas, not TimeAfterEpiphany: RG 72 puts Epiphany INSIDE Christmas // Time, which runs to 13 January. The slug is unchanged. @@ -330,6 +347,19 @@ func temporalEF(date time.Time) temporalDay { return efCel(season, "ef-"+string(slugSeason)+"-"+strconv.Itoa(week)+"-"+weekdayLower(date), col, rank, week) } +// sundayFallsJan2to5 reports whether any Sunday falls in RG 17(a)'s own window, +// 2 to 5 January inclusive. When one does the Holy Name is kept on it; when +// none does the feast falls back to 2 January, which is what "secus die 2 +// ianuarii" provides for. +func sundayFallsJan2to5(y int) bool { + for day := 2; day <= 5; day++ { + if time.Date(y, time.January, day, 0, 0, 0, 0, time.UTC).Weekday() == time.Sunday { + return true + } + } + return false +} + // firstSundayAfterEpiphany returns the first Sunday strictly after 6 January // of year y -- the anchor the weeks after Epiphany are numbered from. When // Epiphany itself falls on a Sunday the next one is meant, which is why the |