In the Eastern Orthodox Church and those Eastern Catholic Churches that use the Byzantine Rite, Psalm 137 (known by its Septuagint numbering as Psalm 136) is a part of the Nineteenth Kathisma (division of the Psalter) and is read at Matins on Friday mornings throughout the year, except during Bright Week (the week following Easter Sunday) when no psalms at all are read.[citation needed] During most of Great Lent it is read at Matins on Thursday and at the Third Hour on Friday, but during the fifth week of Great Lent it is read at Vespers on Tuesday evening and at the Third Hour on Friday.[citation needed]