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Eastern Orthodox Church
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History Church Fathers Pentarchy Byzantine Empire Christianization of Georgia Christianization of Bulgaria Christianization of Kievan Rus' Great Schism Russia Ottoman Empire North America Moscow–Constantinople schism 15th–16th c. 1996 2018
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Liturgy and worship Divine Liturgy Divine Services Akathist Apolytikion Artos Ectenia Euchologion Holy Water Iconostasis Jesus Prayer Kontakion Liturgical entrances Liturgical fans Lity Memorial service Memory Eternal Omophorion Eastern Orthodox bowing Eastern Orthodox marriage Praxis Paraklesis Paschal greeting Paschal Homily Paschal troparion Prayer rope Prosphora Russian bell ringing Semantron Sign of the cross Sticheron Troparion Vestments Use of incense
Liturgical calendar Paschal cycle 12 Great Feasts Other feasts: Feast of Orthodoxy Intercession of the Theotokos The four fasting periods: Nativity Fast Great Lent Apostles' Fast Dormition Fast
Major figures Athanasius of Alexandria Ephrem the Syrian Basil of Caesarea Cyril of Jerusalem Gregory of Nazianzus Gregory of Nyssa John Chrysostom Cyril of Alexandria John Climacus Maximus the Confessor John of Damascus Theodore the Studite Kassiani Cyril and Methodius Photios I of Constantinople Gregory Palamas
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The horologion or horologium (pl. horologia), also known by other names, is the book of hours for the Eastern Orthodox and Eastern Catholic Churches.^[1] It provides the acolouthia (ἀκολουθίαι, akolouthíai), the fixed portions of the Divine Service used every day at certain canonical hours. Additional parts of the service are changed daily, mostly according to the Menologium.

^ Herbermann, Charles George. The Catholic Encyclopedia: An International Work of Reference on the Constitution, Doctrine, Discipline, and History of the Catholic Church, Volume 9. Encyclopedia Press, 1913. 303.