Canonical hours
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In the practice of Christianity, canonical hours mark the divisions of the day in terms of fixed times of prayer at regular intervals. A book of hours, chiefly a breviary, normally contains a version of, or selection from, such prayers.
Opening versicle Domine labia mea aperies et os meum annuntiabit laudem tuam from a book of hours, ca. a 1520
Breviary of Beatrice van Assendelft, 1485
Cistercians singing the Liturgy of the Hours at Heiligenkreuz Abbey
Traditionally, monastic communities pray the Divine Office in the choir of the church.
Fixed prayer times
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Fixed prayer times, praying at dedicated times during the day, are common practice in major world religions such as Judaism, Christianity, and Islam.
Jews stop to pray Maariv (evening prayer) while at a Tel Aviv flea-market shop
Image: Agpeya Breviary
Image: Shehimo Breviary