सहस्रयुगपर्यन्तमहर्यद्ब्रह्मणो विदु: | रात्रिं युगसहस्रान्तां तेऽहोरात्रविदो जना: ॥17॥
sahasra-yuga-paryantam ahar yad brahmaṇo viduḥ rātriṁ yuga-sahasrāntāṁ te ’ho-rātra-vido janāḥ
sahasra—one thousand; yuga—age; paryantam—until; ahaḥ—one day; yat—which; brahmaṇaḥ—of Brahma; viduḥ—know; rātrim—night; yuga-sahasra-antām—lasts one thousand yugas; te—they; ahaḥ-rātra-vidaḥ—those who know his day and night; janāḥ—people
Those people who are knowers of what day and night are, know the day of Brahma which ends in a thousand yugas [The four yugas (in the human worlds), viz Satya, Treta, Dwapara, and Kali are made up of 4,320,000 years. This period multiplied by a thousand constitutes one day of Brahma. His night also extends over an equal period.], and His night which ends in a thousand yugas.