Bhagavad Gita 8.24

dhūmaḥ: smoke;

rātriḥ: night;

tathā: also;

kṛṣṇaḥ: the fortnight of the dark moon;

ṣaṭ: māsāḥ — the six months;

dakṣiṇa: ayanam — when the sun passes on the southern side;

tatra: there;

cāndramasam: the moon planet;

jyotiḥ: the light;

yogī: the mystic;

prāpya: achieving;

nivartate: comes back .;