An octave is the eight-day period during which Easter or Christmas is celebrated, and includes the actual feast. The eighth day is also called the octave or “octave day,” and days in between are said to be “within the octave”. The feast itself is considered the first day, and it is followed by six days called “days within the octave.” The Easter Octave begins on Easter Sunday and ends on the Second Sunday of Easter of the Divine Mercy with every day being another solemnity or another “little Easter.” The current title for each of the octave is “Monday in the Octave of Easter,” “Tuesday in the Octave of Easter” etc., but commonly called “Easter Monday,” “Easter Tuesday,” and so forth.