A kathisma (Greek: κάθισμα; Slavonic: каѳисма, kai-isma), literally, "seat", is a division of the Psalter, used in the Eastern Orthodox and Byzantine rite Catholic churches. The word may also describe a hymn sung at Matins, a seat used in monastic churches, or a type of monastic establishment.
To facilitate this, the 150 psalms were divided into 20 sections, called kathismata (; , meaning literally, "sittings"). The name is derived from the fact that, in the Office as it developed in Jerusalem and Constantinople, the psalms would be read by one of the brethren while the others sat and listened attentively.
Each kathisma is further subdivided into three (), literally, "standings", because at the end of each stasis () the reader says: "Glory to the Father, and to the Son, and to the Holy Spirit..." at which all stand in honor of the Holy Trinity.
The Orthodox Church uses as its official version of the Old Testament, the ancient Septuagint (Greek) as opposed to the more recent Masoretic (Hebrew) recension. For this reason, the numbering of the psalms follows the Greek rather than the Hebrew (the King James Version of the Bible follows the Hebrew numbering). The difference in numbering can be determined from the following table:
1-8 | 1-8 |
9 | 9-10 |
10-112 | Add 1 to the number of each psalm |
113 | 114-115 |
114 | 116:1-9 |
115 | 116:10-19 |
116-145 | Add 1 to the number of each psalm |
146 | 147:1-11 |
147 | 147:12-20 |
148-150 | 148-150 |
The divisions of the psalms into kathismata is as follows (using the Septuagint numbering):
I | 1-3 | 4-6 | 7-8 |
II | 9-10 | 11-13 | 14-16 |
III | 17 | 18-20 | 21-23 |
IV | 24-26 | 27-29 | 30-31 |
V | 32-33 | 34-35 | 36 |
VI | 37-39 | 40-42 | 43-45 |
VII | 46-48 | 49-50 | 51-54 |
VIII | 55-57 | 58-60 | 61-63 |
IX | 64-66 | 67 | 68-69 |
X | 70-71 | 72-73 | 74-76 |
XI | 77 | 78-80 | 81-84 |
XII | 85-87 | 88 | 89-90 |
XIII | 91-93 | 94-96 | 97-100 |
XIV | 101-102 | 103 | 104 |
XV | 105 | 106 | 107-108 |
XVI | 109-111 | 112-114 | 115-117 |
XVII | 118:1-72 | 118:73-131 | 118:132-176 |
XVIII | 119-123 | 124-128 | 129-133 |
XIX | 134-136 | 137-139 | 140-142 |
XX | 143-144 | 145-147 | 148-150 |
The kathismata are divided up between Vespers and Matins, so that all 150 psalms are read during the course of the week. Normally there is one kathisma at Vespers and either two or three at Matins, depending on the day of the week and the time of the year, according to the Church's liturgical calendar. On Sunday nights and the nights following an All-Night Vigil, there will be no kathisma at Vespers. During Great Lent, kathismata are read during the Little Hours also, so that the entire Psalter is completed twice in a week.
Besides the 150 Psalms, the Psalter also contains the nine biblical Canticles which are chanted at matins alongside the canon which evolved from them.
Kathisma XVII, which is composed entirely of Psalm 118, "The Psalm of the Halakha," is an important component of Matins on Saturdays, some Sundays, Monday-Friday Midnight office, and at the funeral service. The entire Book of Psalms is traditionally read aloud or chanted at the side of the deceased during the whole time from death until the funeral, mirroring Jewish tradition, and is a major element of the wake. When the Psalms are read at a wake, there are special hymns and ektenia for the departed that are chanted between each kathisma, often printed at the end of the Psalter.
Some monastery have a tradition of a "Cell Rule" whereby each monastic will pray several kathismata a day in addition to the ones that are said publicly during the services. Some Psalters have special hymns and prayers printed between the kathismata to be read as devotions when reciting the Cell Rule. In the 20th century, some lay Christians have adopted a continuous reading of the psalms on weekdays, praying the whole book in four weeks, three times a day, one kathisma a day.
In the East Syriac Rite, the Psalter is divided into similar sections called hulali.
The bishop has a special kathisma which is more ornate than the ordinary monk's. It is normally located on the right kliros (choir), at the westernmost end, and is often elevated above the others and may have a canopy above it (see cathedra).
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