Acolouthia
The fixed portions of the services are found in the following liturgical books:
- Horologion (Greek: Ωρολόγιον; Slavonic: Chasoslov, Часocлoвъ), or Book of Hours, provides the fixed portions of the services as used by the reader and the chanters. For the sake of convenience, some small portions of the sequences are often included as well, such as feast day troparia, kontakia, and those portions which change according to the day of the week. The Horologion may also contain some devotional material such as the Prayers Before Communion, Thanksgiving After Communion, and Morning and Evening Prayers.
- Euchologion (Greek: Ευχολόγιον, Eukhologion; Slavonic: Слѹжебникъ, Sluzhebnik)—Contains the fixed portions of the services which are said by the priest and deacon, as well as some of the variable portions which the clergy use, such as prokeimena and dismissals. The Great Euchologion contains the clergy parts of Vespers, Matins, the three Divine Liturgies, Compline and Midnight Office, the Lenten Hours. It also contains the complete services (including the parts for reader and chanters) for the Sacred Mysteries (Sacraments), Funeral, Monastic Tonsure, Consecration of a Church, and other occasional services. For convenience, the contents of the Great Euchologion in the Slavic tradition have been divided up as follows:
- Litourgicon (Slavonic: Sluzhebnik)—contains Vespers, Matins and the three Divine Liturgies
- Archieratikon (Slavonic: Chinovnik)—contains the parts of services performed by a bishop
- Euchologion (Slavonic: Trebnik)—omits the portions contained in the Litourgicon and Archieratikon, and adds other minor acolouthia (such as the blessing of an Iconostasis, Holy Vessels, Vestments, etc.)
Read more about this topic: Liturgical Book, Byzantine Rite