Fixed prayer times
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Fixed prayer times 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
A board with precalculated prayer times in a mosque. Stated in the local time, the Muslim prayer times differ by locations and change from day to day.
Agpeya Breviary
Shehimo Breviary
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
Fixed prayer times
…as well certain Oriental Protestant denominations (such as the Mar Thoma Syrian Church), use a breviary such as the Agpeya and Shehimo to pray the canonical hours seven times a day while facing ad orientem, in anticipation of the Second Coming of Jesus; this Christian practice has its roots in Psalm 119:164, in…
Opening verse from a Book of Hours Domine labia mea aperies et os meum annuntiabit laudem tuam, c. 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.