SB 5.21.6

यावद्दक्षिणायनमहानि वर्धन्ते यावदुदगयनं रात्रयः ॥६॥

yāvad dakṣiṇāyanam ahāni vardhante yāvad udagayanaṁ rātrayaḥ

yāvat - until; dakṣiṇa-ayanam - the sun passes to the southern side; ahāni - the days; vardhante - increase; yāvat - until; udagayanam - the sun passes to the northern side; rātrayaḥ - the nights.

Text

Until the sun travels to the south the days grow longer, and until it travels to the north the nights grow longer.

Purport

Srimad Bhagavatam. Canto 5: The Creative Impetus

Chapter 21: The Movements of the Sun. Text 6

Until the sun travels to the south the days grow longer, and until it travels to the north the nights grow longer.