The Byzantine hours
Byzantine rite · Eastern Orthodox Church · Greek
Vespers opens the day, and the Typikon carries the order for each.
A form of The divine office — The prayer of the hours, kept in common. Egeria watched it done at Jerusalem in the 380s and wrote down the times.
After The Typikon · ch. 9, on Vespers and Matins of weekdays — the 9th hour said in the narthex, then Vespers begun in the church.