sahasra — one thousand; yuga — millenniums; paryantam — including; ahaḥ — day; yat — that which; brahmaṇaḥ — of Brahmā; viduḥ — they know; rātrim — night; yuga — millenniums; sahasra-antām — similarly, ending after one thousand; te — they; ahaḥ-rātra — day and night; vidaḥ — who understand; janāḥ — people.