viduraivaṁ prabhāṣyate

samvatsarah-orbit of the sun; parivatsarah-circumambulation of Brhaspati; idavatsarah-orbit of the stars; eva-as they are; ca-also; anuvatsarah-orbit of the moon; vatsarah-one calendar year; ca-also; vidura-O Vidura; evam-thus; prabhasyate-they are so told.