and, if impeded, requiring to be commemorated: ferias of Advent from 17 December to 23 December, and Ember Days of Advent, Lent and September; Third-class ferias: ferias in Lent from Thursday after Ash Wednesday to Saturday before the Second Sunday of the Passion (Palm Sunday) except Ember Days (these outranked third-class feasts), and ferias in Advent up to 16 December except Ember Days (these were outranked by third-class feasts); Fourth-class ferias: all other ferias (weekday liturgies). Before 1960, the Roman Rite knew a simpler distinction between major and minor ferias. The major ferias were those of Advent and Lent, the Ember days, and the Monday of Rogation week. These had to be commemorated even on the highest feasts. All the others were minor ferias (liturgical weekdays). In addition, the major ferias of Ash Wednesday and Holy Week were privileged: these liturgies were to be celebrated no matter what feast happened to occur on those days. See also Ranking of liturgical days in the Roman Rite Solemnity Memorial Ember Days Octave General Roman Calendar Liturgical year Calendar of saints Commemoration in the Catholic liturgy Ordinary Time References Catholic liturgy History of the Catholic Church Days of the week