The '''[[Horologion]]''' ([[Greek language|Greek]]: '''῾Ωρολόγιον'''; [[Church Slavonic language|Church Slavonic]]: '''Часocлoвъ''', ''Chasoslov'', ), or '''Book of Hours''', provides the [[Acolouthia]] of the Daily Cycle of services (Greek: ''akolouthies'', ἀκολουθίες) as used by the Orthodox Churchand Eastern Catholic Churches.