The text is in Latin and it's related to the Catholic liturgical calendar.
- "Sanctæ Mariæ Sabbato ~ IV. classis" translates to "Saturday of Saint Mary ~ 4th class". In the context of the Catholic liturgy, a "class" refers to the rank of a feast day, with 1st class being the highest and 4th class being the lowest.
- "Sabbato infra Hebdomadam VI post Octavam Pentecostes" translates to "Saturday within the 6th week after the Octave of Pentecost". The Octave of Pentecost is the eight-day period, or octave, that begins on Pentecost Sunday. So this refers to a Saturday that falls within the sixth week after that period.
(1) Divinum Officium. https://www.divinumofficium.com/cgi-bin/horas/officium.pl?version=Rubrics%201960&browsertime=13-08-2022.
(2) Ordo: Julius 2024. https://officium.sanctamissa.pl/cgi-bin/horas/kalendar.pl.
(3) Ordo: Julius 2024 - Divinum Officium. https://www.divinumofficium.com/cgi-bin/horas/kalendar.pl.
(4) Sanctæ Mariæ Sabbato IV. classis - YouTube. https://www.youtube.com/watch?v=fPRM9kNosWs.
(5) Sanctae Mariae Sabbato ~ IV. classis Sancta Missa Capilla Santa María ....
https://www.facebook.com/JuventudTradicionalGT/videos/sanctae-mariae-sabbato-iv-classissancta-missacapilla-santa-mar%C3%ADa-de-la-asunci%C3%B3n-/606541470113160/.
(6) Divinum Officium. https://www.divinumofficium.com/cgi-bin/horas/Pofficium.pl.
