The typica is used whenever the divine liturgy is not celebrated at its usual time, "i.e.", when there is a vesperal liturgy or no liturgy at all. On days when the liturgy may be celebrated at its usual hour, the typica follows the sixth hour (or matins, where the custom is to serve the Liturgy then) and the Epistle and Gospel readings for the day are read therein; otherwise, on aliturgical days or when the Liturgy is served at vespers, the typica has a much shorter form and is served between the ninth hour and vespers.