Nativity and Theophany
[a] If the Feast falls on a Day other than Sunday and Monday:
On The Paramony:
Evening Aggregate: Ninth Hour — Vespers — Small Complines;
Dawn Aggregate: Midnight Office — Orthros (Matins) — First Hour;
Midday Aggregate: Great Hours (Royal Hours) [1st Hour, 3rd Hour, 6th Hour, 9th Hour, and Typica] — Vespers combined with the Liturgy of Saint Basil, The Great.
On the Day of the Feast:
In Slavonic usage, The Evening and Dawn Aggregates are combined into All-Night-Vigil, to include Great Complines, Great Matins (Orthros), and First Hour. This Midday Aggregate includes the Third and Sixth Hours and the Liturgy of Saint John Chrysostom.
(b) When the Feast falls on Sunday or Monday:
On the preceding Friday:
Evening Aggregate: Ninth Hour — Daily Vespers — Small Complines;
Dawn Aggregate: Midnight Office — Daily Matins (Orthros) — First Hour;
Midday Aggregate: Great Hours (Royal Hours) [1st Hour, 3rd Hour, 6th Hour, 9th Hour and Typika]
The Components of the aggregates for Saturday if the Feast falls on Sunday, and for both Saturday and Sunday if the Fast falls on Monday, are the same as those described (in b, above) for days which have “Theos Kyrios”.
On the day of the Feast:
The Evening Aggregate (which in Slavonic Use begins at 1 P.M.) Includes Ninth Hour. And Great Vespers with the Great Blessing of Waters. The Dawn and Midday Aggregates combine to, Include Midnight Office, Great Matins (Orthros), and the Liturgy of Saint Basil, the Great.