The Rev. heightens the emphasis by following the Greek order, the day of the Lord, that great and notable day. Notable (ἐπιφανῆ) only here in New Testament. The kindred noun ἐπιφάνεια, appearing (compare our word Epiphany), is often used of the second coming of the Lord. See 1Ti 6:14; 2Ti 4:1; Tit 2:13.