Srimad Bhagavatam — Panchama Skandha, Shloka 4
The Orbit of the Sun, the Measure of Day and Night, and the Sun-God’s Chariot
यदा मेषतुलयोर्वर्तते तदाहोरात्राणि समानानि भवन्ति यदा वृषभादिषु पञ्चसु च राशिषु चरति तदाहान्येव वर्धन्ते ह्रसति च मासि मास्येकैका घटिका रात्रिषु ॥ ४ ॥
yadā meṣa-tulayor vartate tadāho-rātrāṇi samānāni bhavanti yadā vṛṣabhādiṣu pañcasu ca rāśiṣu carati tadāhāny eva vardhante hrasati ca māsi māsy ekaikā ghaṭikā rātriṣu.
当太阳行经白羊（Meṣa）与天秤（Tulā）之宫时，昼夜等长。当它行经以金牛（Vṛṣabha）为首的五宫时，白昼渐增，而黑夜每月减少一“伽提迦”(ghaṭikā，半小时)，直到再至天秤宫，昼夜复归相等。
FAQs
This verse states that when the Sun is in Aries and Libra, day and night become equal in duration.
In Canto 5, Śukadeva explains the structure and functioning of the universe, showing how time, seasons, and cosmic order operate under the Lord’s arrangement.
It encourages seeing time and seasonal rhythms as part of a higher cosmic order, supporting disciplined living (routine, balance) and remembrance that all time ultimately moves under divine governance.