dharmam-occupational duties; pravadatah-while describing; tasya-his; sah-that; kalah-time; pratyupasthitah-exactly appeared; yah-that is; yoginah-for the mystics; chanda-mrtyoh-of one who dies according to one's own selection of time; vanchitah-as desired by; tu-but; uttarayanah-period when the sun runs on the northern horizon.