|Madhya-līlā||Chapter 20: Lord Śrī Caitanya Mahāprabhu Instructs Sanātana Gosvāmī in the Science of the Absolute Truth|
Bhaktivedanta VedaBase: Śrī Caitanya Caritāmṛta Madhya 20.390
eka-dui-tina-cāri prahare asta haya
cāri-prahara rātri gele punaḥ sūryodaya
eka-dui-tina-cāri — one, two, three, four; prahare — in praharas; asta haya — the sun sets in the evening; cāri-prahara — generally after four praharas; rātri — the night; gele — when it passes; punaḥ — again; sūryodaya — the sun rises.
"The day and the night are divided into eight praharas — four belonging to the day and four belonging to the night. After eight praharas, the sun rises again.
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His Divine Grace A. C. Bhaktivedanta Swami Prabhupāda, Founder Ācārya of the International Society for Krishna Consciousness