Text 4]
The Movements of the Sun
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eye of the Lord, rotates within the fixed orbit of eternal time. The sun is the king of all planetary systems and has unlimited potency in heat and light.” Although the sun is described as  bhagavān , the most powerful, and although it is actually the most powerful planet within the universe, it nevertheless has to carry out the order of Govinda, Kṛṣṇa. The sun-god cannot deviate even an inch from the orbit designated to him. Therefore in every sphere of life, the supreme order of the Supreme Personality of Godhead is carried out. The entire material nature carries out His orders. However, we foolishly see the activities of material nature without understanding the supreme order and Supreme Person behind them. As confirmed in  Bhagavad-gītā ,  mayādhyakṣeṇa prakṛtiḥ : material nature carries out the orders of the Lord, and thus everything is maintained in an orderly way.
TEXT 4
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.
yadā —when;  meṣa-tulayoḥ —in Meṣa (Aries) and Tulā (Libra);  vartate —the sun exists;  tadā —at that time;  ahaḥ-rātrāṇi —the days and nights;  samānāni —equal in duration;  bhavanti —are;  yadā —when;  vṛṣabha-ādiṣu —headed by Vṛṣabha (Taurus) and Mithuna (Gemini);  pañcasu —in the five;  ca —also;  rāśiṣu —signs;  carati —moves;  tadā —at that time;  ahāni —the days;  eva —certainly;  vardhante —increase;  hrasati —is diminished;  ca —and;  māsi māsi —in every month;  eka-ekā —one;  ghaṭikā —half hour;  rātriṣu —in the nights.
TRANSLATION
When the sun passes through Meṣa [Aries] and Tulā [Libra], the durations of day and night are equal. When it passes through the five signs headed by Vṛṣabha [Taurus], the duration of the days