Apodosis of Nativity

Apodosis of a feast means leavetaking of a feast and is the final day a feast is celebrated (usually seven days) in the Church.

Troparion of the Feast, Tone IV —

Thy nativity, O Christ our God,/ hath shone forth the light of knowledge upon the world;/ for therein those who worship the stars/ have been taught by a star to worship Thee,/ the Sun of righteousness,/ and to know Thee the Orient from on high.// O Lord, glory be to Thee!