Orthros

In the Eastern Churches, Orthros (Greek (ὄρθρος, meaning "early dawn" or "daybreak") or Oútrenya (Slavonic Оўтреня) is the last of the four night offices, which also include Vespers, Compline, and Midnight Office. In traditional monasteries it is celebrated daily so as to end at sunrise. In parishes it is normally served only on Sundays and feast days. It is sometimes called Matins after the western liturgy it most nearly corresponds to.