Canonical hours

type of Christian devotional book, popular in the Middle Ages

Christian concept of periods of prayer throughout the day

The horologion or horologium (pl. horologia), also known by other names, is the book of hours for the Eastern Orthodox and Eastern Catholic Churches. It provides the acolouthia (, 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.

time of day when the devil, demons or ghosts are supposed to come out