अग्निर्ज्योतिरहः शुक्लः षण्मासा उत्तरायणम्। तत्र प्रयाता गच्छन्ति ब्रह्म ब्रह्मविदो जनाः
agnir jyotir ahaḥ śhuklaḥ ṣhaṇ-māsā uttarāyaṇam tatra prayātā gachchhanti brahma brahma-vido janāḥ
If the sage, knowing the Supreme Spirit, goes forth with fire and light during the day, in the fortnight of the waxing moon, and in the six months before the Northern summer solstice, he will attain the Supreme.
Translated by Shri Purohit Swami
Fire, light, daytime, the bright fortnight, the six months of the northern path of the sun (the northern solstice) departing, then men who know Brahman go to Brahman.
Translated by Swami Sivananda
Word meanings (from the gita/gita dataset)
agniḥ—fire; jyotiḥ—light; ahaḥ—day; śhuklaḥ—the bright fortnight of the moon; ṣhaṭ-māsāḥ—six months; uttara-ayanam—the sun’s northern course; tatra—there; prayātāḥ—departed; gachchhanti—go; brahma—Brahman; brahma-vidaḥ—those who know the Brahman; janāḥ—persons;