What is a Kathisma?

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(pi. kathismata) Each of the twenty sections into which the Psalter is divided. Also a short troparion, chanted or read during Matins at the end of each kathisma from the Psalter.

How to Read the Orthodox Psalter

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Every Kathisma is divided into three stases; after each of the first two stases the following is said: Glory to the Father, and to the Son, and to the Holy Spirit; both now and ever, and unto the ages of ages. Amen. Alleluia, Alleluia, Alleluia. Glory to Thee, O God. (Thrice) Lord, have mercy. (Thrice) Glory to the Father, and to the Son, and to the Holy Spirit; both now and ever, and unto the ages of ages. Amen. But at the end of the whole Kathisma: Glory to the Father, and to the Son, and to the Holy Spirit; both now and ever, and unto the ages of ages. Amen. Alleluia, Alleluia, Alleluia. Glory to Thee, O God. (Twice) Alleluia, Alleluia, Alleluia. Glory to Thee, O God our Hope, O Lord, glory be to Thee.