"Let me worship," Lord Brahmā said, "the Supreme Personality of Godhead, Govinda (Kṛṣṇa), who is the original person and under whose order the sun, which is the king of all planets, is assuming immense power and heat. The sun represents the eye of the Lord and traverses its orbit in obedience to His order."
The sun is the king of the planets, and the sun-god (at present of the name Vivasvān) rules the sun planet, which is controlling all other planets by supplying heat and light. He is rotating under the order of Kṛṣṇa, and Lord Kṛṣṇa originally made Vivasvān His first disciple to understand the science of Bhagavad-gītā. The Gītā is not, therefore, a speculative treatise for the insignificant mundane scholar but is a standard book of knowledge coming down from time immemorial.
(Bhagavad-Gita-----4:1-----purport).

Happiness is the nature of the spirit, as stated in the Vedānta-sūtras: ānandamayo 'bhyāsāt—the spirit is by nature full of happiness. Happiness in spiritual nature always increases in volume with a new phase of appreciation; there is no question of decreasing the bliss. Such unalloyed spiritual bliss is nowhere to be found within the orbit of the material universe, including the Janaloka planets, or, for that matter, the Maharloka or Satyaloka planets, because even Lord Brahmā is subject to the laws of fruitive actions and the law of birth and death. It is therefore stated here: duratyayaḥ, or, in other words, spiritual happiness in the eternal kingdom of God cannot be imagined even by the great brahmacārīs or sannyāsīs who are eligible to be promoted to the planets beyond the region of heaven.
(Srimad Bhagavatam-----2:6:18-----purport).

When the Lord's pastimes are visible to the human eye, they are called prakaṭa, and when they are not visible they are called aprakaṭa. In fact, the Lord's pastimes never stop, just as the sun never leaves the sky. The sun is always in its right orbit in the sky, but it is sometimes visible and sometimes invisible to our limited vision. Similarly, the pastimes of the Lord are always current in one universe or another, and when Lord Kṛṣṇa disappeared from the transcendental abode of Dvārakā, it was simply a disappearance from the eyes of the people there. It should not be misunderstood that His transcendental body, which is just suitable for the pastimes in the mortal world, is in any way inferior to His different expansions in the Vaikuṇṭhalokas. His body manifested in the material world is transcendental par excellence in the sense that His pastimes in the mortal world excel His mercy displayed in the Vaikuṇṭhalokas.
(Srimad Bhagavatam-----3:2:12-----purport).

Standard time is calculated in terms of the movement of the sun. The time covered by the sun in passing over an atom is calculated as atomic time. The greatest time of all covers the entire existence of the nondual manifestation. All the planets rotate and cover space, and space is calculated in terms of atoms. Each planet has its particular orbit for rotating, in which it moves without deviation, and similarly the sun has its orbit. The complete calculation of the time of creation, maintenance and dissolution, measured in terms of the circulation of the total planetary systems until the end of creation, is known as the supreme kāla.
(Srimad Bhagavatam-----3:11:4-----purport).

In the Brahma-saṁhitā it is stated that the sun is the eye of the Supreme and it rotates in its particular orbit of time. Similarly, beginning from the sun down to the atom, all bodies are under the influence of the kāla-cakra, or the orbit of eternal time, and each of them has a scheduled orbital time of one saṁvatsara.
(Srimad Bhagavatam-----3:11:13-----purport).

Two pakṣas comprise one month, and twelve months comprise one calendar year, or one full orbit of the sun. A human being is expected to live up to one hundred years. That is the way of the controlling measure of eternal time.
(Srimad Bhagavatam-----3:11:14-----purport).

"I worship Govinda, the primeval Lord, the Supreme Personality of Godhead, under whose control even the sun, which is considered to be the 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."
(Srimad Bhagavatam-----3:11:14-----purport).

The planets occupied by the demigods are restricted to their own orbits, but Kardama Muni, by his yogic power, could travel all over the different directions of the universe without restriction. The living entities who are within the universe are called conditioned souls; that is, they are not free to move everywhere. We are inhabitants of this earthly globe; we cannot move freely to other planets. In the modern age, man is trying to go to other planets, but so far he has been unsuccessful. It is not possible to travel to any other planets because by the laws of nature even the demigods cannot move from one planet to another. But Kardama Muni, by his yogic power, could surpass the strength of the demigods and travel in space in all directions. The comparison here is very suitable.
(Srimad Bhagavatam-----3:23:41-----purport).

Each and every planet within the universe travels at a very high speed. From a statement in Śrīmad-Bhāgavatam it is understood that even the sun travels sixteen thousand miles in a second, and from Brahma-saṁhitā we understand from the śloka, yac-cakṣur eṣa savitā sakala-grahāṇām that the sun is considered to be the eye of the Supreme Personality of Godhead, Govinda, and it also has a specific orbit within which it circles. Similarly, all other planets have their specific orbits. But together all of them encircle the polestar, or Dhruvaloka, where Dhruva Mahārāja is situated at the summit of the three worlds. We can only imagine how highly exalted the actual position of a devotee is, and certainly we cannot even conceive how exalted is the position of the Supreme Personality of Godhead.
(Srimad Bhagavatam-----4:12:39-----purport).

In this verse the word yathārkaḥ indicates that the sun is not fixed but is rotating in its orbit, which is set by the Supreme Personality of Godhead. This is confirmed in the Brahma-saṁhitā and also in other parts of Śrīmad-Bhāgavatam. In the Fifth Canto of Śrīmad-Bhāgavatam it is stated that the sun rotates in its own orbit at the rate of sixteen thousand miles per second. Similarly, Brahma-saṁhitā states, yasyājñayā bhramati sambhṛta-kāla-cakraḥ: the sun rotates in its own orbit according to the order of the Supreme Personality of Godhead. The conclusion is that the sun is not fixed in one place. As far as Pṛthu Mahārāja is concerned, it is indicated that his ruling power would extend all over the world. The Himalaya Mountains, from which the sunrise is first seen, are called udayācala or udayādri. It is herein indicated that Pṛthu Mahārāja's reign over the world would cover even the Himalaya Mountains and extend to the borders of all oceans and seas. In other words, his reign would cover the entire planet.
(Srimad Bhagavatam-----4:16:20-----purport).

This refers to the time when Lord Kṛṣṇa appeared as the supreme boar, Varāha, and rescued the earth, which had been merged in water. The asura Hiraṇyākṣa had dislocated the earth from its orbit and thrown it beneath the waters of the Garbhodaka Ocean. Then the Lord, in the shape of the original boar, rescued the earth.
(Srimad Bhagavatam-----4:17:34-----purport).

In this connection, the darkness occurring before the full moon, the lunar eclipse, can be explained as being another planet, known as Rāhu. According to Vedic astronomy, the Rāhu planet, which is not visible, is accepted. Sometimes the Rāhu planet is visible in the presence of full moonlight. It then appears that this Rāhu planet exists somewhere near the orbit of the moon. The failure of modern moon excursionists may be due to the Rāhu planet. In other words, those who are supposed to be going to the moon may actually be going to this invisible planet Rāhu. Actually, they are not going to the moon but to the planet Rāhu, and after reaching this planet, they come back. Apart from this discussion, the point is that a living entity has immense and unlimited desires for material enjoyment, and he has to transmigrate from one gross body to another until these desires are exhausted.
(Srimad Bhagavatam-----4:29:69-----purport).

The sunshine is light, the sun globe itself is light, and the sun-god is also light. However, the sunshine is not identical with the sun-god, Vivasvān. This is the meaning of simultaneously one and different (acintya-bhedābheda-tattva). All the planets rest on the sunshine, and because of the heat of the sun, they all revolve in their orbits. On each and every planet, the trees and plants grow and change colors due to the sunshine. Being the rays of the sun, the sunshine is nondifferent from the sun. Similarly, all the planets, resting on the sunshine, are nondifferent from the sun. The entire material world is completely dependent on the sun, being produced by the sun, and the cause, the sun, is inherent in the effects. Similarly, Kṛṣṇa is the cause of all causes, and the effects are permeated by the original cause. The entire cosmic manifestation should be understood as the expanded energy of the Supreme Lord.
(Srimad Bhagavatam-----4:31:16-----purport).

From the description in this verse, it appears that the sun moves. According to modern astronomers, the sun is fixed in one place, surrounded by the solar system, but here we find that the sun is not stationary: it is rotating in a prescribed orbit. This fact is corroborated by Brahma-saṁhitā (5.52). Yasyājñayā bhramati saṁbhṛta-kāla-cakraḥ: the sun is rotating in its fixed orbit in accordance with the order of the Supreme Personality of Godhead. According to Jyotir Veda, the science of astronomy in the Vedic literature, the sun moves for six months on the northern side of the Sumeru Hill and for six months on the southern side. We have practical experience on this planet that when there is summer in the north there is winter in the south and vice versa.
(Srimad Bhagavatam-----5:1:30-----purport).

In the middle of that island is a great mountain named Mānasottara, which forms the boundary between the inner side and the outer side of the island. Its breadth and height are 10,000 yojanas (80,000 miles). On that mountain, in the four directions, are the residential quarters of demigods such as Indra. In the chariot of the sun-god, the sun travels on the top of the mountain in an orbit called the Saṁvatsara, encircling Mount Meru. The sun's path on the northern side is called Uttarāyaṇa, and its path on the southern side is called Dakṣiṇāyana. One side represents a day for the demigods, and the other represents their night.
(Srimad Bhagavatam-----5:20:30-----translation).

"I worship Govinda, the primeval Lord, the Supreme Personality of Godhead under whose control even the sun, which is considered to be the 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 orbitdesignated 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: (B.G.9:10) material nature carries out the orders of the Lord, and thus everything is maintained in an orderly way.
(Srimad Bhagavatam-----5:21:3-----purport).

The distance indicated by the word sādhikāni is pañca-viṁśati-sahasrādhikāni, or 25,000 yojanas. That plus two and a half crores and twelve and a half lakṣa of yojanas is the distance the sun travels between each two cities. This comes to 23,775,000 yojanas, or 190,200,000 miles. The total orbit of the sun is four times that distance, or 95,100,000 yojanas (760,800,000 miles).
(Srimad Bhagavatam-----5:21:10-----purport).

In this chapter the orbits of the planets are described. According to the movements of the moon and other planets, all the inhabitants of the universe are prone to auspicious and inauspicious situations. This is referred to as the influence of the stars.
The sun-god, who controls the affairs of the entire universe, especially in regard to heat, light, seasonal changes and so on, is considered an expansion of Nārāyaṇa. He represents the three Vedas-Ṛg, Yajur and Sāma-and therefore he is known as Trayīmaya, the form of Lord Nārāyaṇa. Sometimes the sun-god is also called Sūrya Nārāyaṇa. The sun-god has expanded himself in twelve divisions, and thus he controls the six seasonal changes and causes winter, summer, rain and so on. Yogīs and karmīs following the varṇāśrama institution, who practice haṭha or aṣṭāṅga-yoga or who perform agnihotra sacrifices, worship Sūrya Nārāyaṇa for their own benefit.
(Srimad Bhagavatam-----5:22-----summary).

The sun travels sometimes slowly, sometimes swiftly and sometimes at a moderate speed. In this way it travels within the three worlds, consisting of the heavenly planets, the earthly planets and outer space. These orbits are referred to by great learned scholars by the names Saṁvatsara, Parivatsara, Iḍāvatsara, Anuvatsara and Vatsara.
The moon is situated 100,000 yojanas above the rays of the sunshine. Day and night on the heavenly planets and Pitṛloka are calculated according to its waning and waxing. Above the moon by a distance of 200,000 yojanas are some stars, and above these stars is Śukra-graha (Venus), whose influence is always auspicious for the inhabitants of the entire universe.
(Srimad Bhagavatam-----5:22-----summary).

According to the description of this verse, the hundreds and thousands of stars and the great planets such as the sun, the moon, Venus, Mercury, Mars and Jupiter are not clustered together because of the law of gravity or any similar idea of the modern scientists. These planets and stars are all servants of the Supreme Personality of Godhead, Govinda or Kṛṣṇa, and according to His order they sit in their chariots and travel in their respective orbits. The orbits in which they move are compared to machines given by material nature to the operating deities of the stars and planets, who carry out the orders of the Supreme Personality of Godhead by revolving around Dhruvaloka, which is occupied by the great devotee Mahārāja Dhruva.
(Srimad Bhagavatam-----5:23:3-----purport).

"I worship Govinda, the primeval Lord, the Supreme Personality of Godhead, under whose control even the sun, which is considered to be the 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." This verse from Brahma-saṁhitā confirms that even the largest and most powerful planet, the sun, rotates within a fixed orbit, or kāla-cakra, in obedience to the order of the Supreme Personality of Godhead. This has nothing to do with gravity or any other imaginary laws created by the material scientists.
(Srimad Bhagavatam-----5:23:3-----purport).

The seven stars revolving around the polestar at the zenith are called saptarṣi-maṇḍala. On these seven stars, which form the topmost part of our planetary system, reside seven sages: Kaśyapa, Atri, Vasiṣṭha, Viśvāmitra, Gautama, Jamadagni and Bharadvāja. These seven stars are seen every night, and they each make a complete orbit around the polestar within twenty-four hours. Along with these seven stars, all the others stars also orbit from east to west. The upper portion of the universe is called the north, and the lower portion is called the south. Even in our ordinary dealings, while studying a map, we regard the upper portion of the map as north.
(Srimad Bhagavatam-----9:16:24-----purport).

"The sun is the king of all planetary systems and has unlimited potency in heat and light. I worship Govinda, the primeval Lord, the Supreme Personality of Godhead, under whose control even the sun, which is considered to be the eye of the Lord, rotates within the fixed orbit of eternal time." Although we see the cosmic manifestation as gigantic and wonderful, it is within the limitations of kāla, the time factor. This time factor is also controlled by the Supreme Personality of Godhead, as confirmed in Bhagavad-gītā (mayādhyakṣeṇa prakṛtiḥ sūyate sa-carācaram (B.G.9:10). Prakṛti, the cosmic manifestation, is under the control of time. Indeed, everything is under the control of time, and time is controlled by the Supreme Personality of Godhead. Therefore the Supreme Lord has no fear of the onslaughts of time. Time is estimated according to the movements of the sun (savitā).
(Srimad Bhagavatam-----10:3:26-----purport).

Time is estimated according to the movements of the sun (savitā). Every minute, every second, every day, every night, every month and every year of time can be calculated according to the sun's movements. But the sun is not independent, for it is under time's control. Bhramati saṁbhṛta-kāla-cakraḥ: the sun moves within the kāla-cakra, the orbit of time. The sun is under the control of time, and time is controlled by the Supreme Personality of Godhead. Therefore the Lord has no fear of time.
The Lord is addressed here as avyakta-bandhu, or the inaugurator of the movements of the entire cosmic manifestation. Sometimes the cosmic manifestation is compared to a potter's wheel. When a potter's wheel is spinning, who has set it in motion? It is the potter, of course, although sometimes we can see only the motion of the wheel and cannot see the potter himself.
(Srimad Bhagavatam-----10:3:26-----purport).

Lord Brahmā had gone away for only a moment of his time, but when he returned, a year of human time had passed. On different planets, the calculation of time is different. To give an example, a man-made satellite may orbit the earth in an hour and twenty-five minutes and thus complete one full day, although a day ordinarily takes twenty-four hours for those living on earth. Therefore, what was but a moment for Brahmā was one year on earth. Kṛṣṇa continued to expand Himself in so many forms for one year, but by the arrangement of yogamāyā no one could understand this but Balarāma.
(Srimad Bhagavatam-----10:13:40-----purport).

We can just imagine, therefore, the gigantic brain whose arrangements sustain the gravity of the unlimited number of planets and satellites and who creates the unlimited space in which they float. If one considers the intelligence needed to orbit man-made satellites, one cannot be fooled into thinking that there is not a gigantic intelligence responsible for the arrangements of the various planetary systems. There is no reason to believe that all the gigantic planets float in space without the superior arrangement of a superior intelligence. This subject is clearly dealt with in the Bhagavad-gītā (15.13), where the Personality of Godhead says, "I enter into each planet, and by My energy they stay in orbit." Were the planets not held in the grip of the Personality of Godhead, they would all scatter like dust in the air. Modern scientists can only impractically explain this inconceivable strength of the Personality of Godhead.
(Sri Caitanya Caritamrta-----1:2:10-----purport).

Śrīmad-Bhāgavatam also describes how yogīs can travel to all the planets in the universe. When the vital force is lifted to the cerebellum, there is every chance that this force will burst out from the eyes, nose, ears, etc., as these are places that are known as the seventh orbit of the vital force. But the yogīs can block these holes by complete suspension of air. The yogī then concentrates the vital force in the middle position, that is, between the eyebrows. At this position, the yogī can think of the planet to which he wants to go after leaving the body. He can then decide whether he wants to go to the abode of Kṛṣṇa in the transcendental Vaikuṇṭhas, from which he will not be required to descend into the material world, or to travel to higher planets in the material universe. The perfect yogī is at liberty to do either.
(Sri Caitanya Caritamrta-----1:5:22-----purport).

It is said that all the pastimes of Kṛṣṇa are eternal, and this is confirmed in every scripture. Generally people cannot understand how Kṛṣṇa performs His pastimes, but Lord Caitanya clarified this by comparing the performance of His pastimes to the orbit of the sun. According to Vedic astrological calculations, the twenty-four hours of a day are divided into sixty daṇḍas. The days are again divided into 3,600 palas. The sun disc can be perceived crossing the sky in steps of sixty palas each, and that time constitutes a daṇḍa. Eight daṇḍas make one prahara, and the sun rises and sets within four praharas. Similarly, four praharas constitute one night, and after that the sun rises. And just as the sun can be seen in its movement through 3,600 palas, all the pastimes of Kṛṣṇa can be seen in any of the universes.
(Teachings of Lord Caitanya).