The Septuagesima season always begins with the ninth week before Easter and includes three Sundays called respectively Septuagesima, Sexagesima and Quinquagesima. These names which were borrowed from the numeral system of the time, denote a series of decades working back from the commencement of Lent, which is known in Latin as Quadragesima. [As the intervals between these Sundays only consist of seven days it is evident that this name must not be taken in a strictly arithmetical sense; but whereas Quadragesima comes exactly at the closing day of the 4th decade before Easter, Quinquagesima (47 days) falls within the 5th decade, Sexagesima (54 days) within the 6th, Septuagesima '61 days) within the 7th.]
This "strange land" is for the people of Christ, the world, which is a place of exile, while Alleluia, the chant St. John heard in heaven, will begin again in the liturgy at Paschaltide, which represents the future life. In the Easter festivities we shall hail our Lord, the conqueror of Satan, who while freeing us from the bondage of sin, will re-open to us the heavenly kingdom. The season of Lent which lasts for forty days (Quadragesima) and that of Septuagesima which is made up of the following periods of ten days (Quinquagesima, Sexagesima and Septuagesima) may well be taken as representing the seventy years passed by Israel in exile under the harsh captivity of the Babylonians. The chant of Alleluia is silent during this period in which the spirit and very name remind us so strongly, that we are "poor banished children ... mourning and weeping in this vale of tears" (Salve Regina).
The Season of Septuagesima ends in the Temporal Cycle on Ash Wednesday. In the Sanctoral Cycle its extreme limit is March 10, that is, when Easter falls on April 25.