|Canto 5: The Creative Impetus||Chapter 21: The Movements of the Sun|
Bhaktivedanta VedaBase: Srimad Bhagavatam 5.21.6
yavad dakshinayanam ahani vardhante yavad udagayanam ratrayah
yavat -- until; dakshina-ayanam -- the sun passes to the southern side; ahani -- the days; vardhante -- increase; yavat -- until; udagayanam -- the sun passes to the northern side; ratrayah -- the nights.
Until the sun travels to the south the days grow longer, and until it travels to the north the nights grow longer.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupada, Founder Acarya of the International Society for Krishna Consciousness