rātri-āgame

सहस्रयुगपर्यन्तमहर्यद्ब्रह्मणो विदुः

rātrim — night

Those who know that a thousand ages make one day of Brahma, and a thousand ages his night, know day and night.

अव्यक्ताद्व्यक्तयः सर्वाः प्रभवन्त्यहरागमे

rātri-āgame — at the fall of Brahma’s night

At the coming of that day all things manifest emerge from the unmanifest; at the fall of night they dissolve into it again.

भूतग्रामः स एवायं भूत्वा भूत्वा प्रलीयते

rātri-āgame — with the advent of night

This same multitude of beings comes into being again and again, and again and again dissolves, helplessly, at the coming of night.

धूमो रात्रिस्तथा कृष्णः षण्मासा दक्षिणायनम्

rātriḥ — night

Smoke, night, the dark fortnight, the six months of the southern course: departing then, one reaches the light of the moon and returns.