This double Canon of the Nativity has both sets of Katabasiae. Sing the first set from Nov. 21 - Dec. 24. On Christmas, sing them both, as written here. Sing the second set from Dec. 26 - 31. Updated 6/21/13.
This arrangement of 'It is truly meet' was chanted by the Archangel Gabriel when he first revealed this hymn
near Karyes on the Holy Mountain in the year 982. 'Greater in honor' was composed by St. Ephrem the Syrian (4th c.).