The '''[[Horologion]]''' (Greek: '''῾Ωρολόγιον'''; 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 and Eastern Catholic Churches.