The liturgical day
is organized into the hours of the Divine Office and the ritual of the Mass.
The repertory of 150 Psalms is said every week in the hours of the Office.
The illustration of the above link was adapted from John Harper, The Forms and Orders of Western
Liturgy from the tenth to the eighteenth century: A Historical Introduction and Guide for
Students and Musicians (Oxford: Clarendon Press, 1991), Fig. 3.I, p. 47.
The liturgical year is made up of two cycles, one of fixed and variable feasts (the Temporale) and one of saints feasts (the Sanctorale. The illustration was adapted from Harper, Fig. 3.2, p. 48.
