This handbook, in five volumes, represents a complete course of liturgical studies which the Pontifical Liturgical Institute offers to professors and students of liturgy in universities and seminaries and to other persons engaged in liturgical ministry. It is offered as model, source, and reference. This last volume of the series is devoted to the study of the time and space components of the liturgy. Although the Eucharist, sacraments, and sacramentals are all celebrated in time and space, there are three types of liturgical celebrations on which time and space have a direct particular bearing. These are the liturgy of the Hours, the liturgical feasts and seasons in the course of the year, and the dedication of churches. The first two relate to time; the third, to space.