The effulgent luminary planets like the sun and the moon are situated almost in the midplace of the universe, and as such they are to be known as the chest of the original gigantic form of the Lord. And above the luminary planets, called also the heavenly places of the universal directorate demigods, are the Mahar, Janas and Tapas planetary systems, and, above all, the Satyaloka planetary system, where the chief directors of the modes of material nature reside, namely Viṣṇu, Brahmā and Śiva. This Viṣṇu is known as the Kṣīrodakaśāyī Viṣṇu, and He acts as the Supersoul in every living being. There are innumerable universes floating on the Causal Ocean, and in each of them the representation of the virāṭ form of the Lord is there along with innumerable suns, moons, heavenly demigods, Brahmās, Viṣṇus and Śivas, all of them situated in one part of the inconceivable potency of Lord Kṛṣṇa, as stated in the Bhagavad-gītā (10.42).
(Srimad Bhagavatam------2:1:28------purport).

When the King of heaven, Indra, surrendered to Kṛṣṇa after Kṛṣṇa had raised Govardhana Hill, Lord Indra stated that above the planetary systems wherein human beings reside is the sky, where birds fly. Above the sky is the sun and its orbit. This is the entrance to the heavenly planets. Above the heavenly planets are other planets, up to Brahmaloka, where those advancing in spiritual knowledge reside. The planets up to Brahmaloka are part of the material world (Devī-dhāma). Because the material world is under the control of Devī, Durgā, it is called Devī-dhāma. Above Devī-dhāma is a place where Lord Śiva and his wife Umā reside. Those brightened by spiritual knowledge and liberated from material contamination reside in that Śivaloka. Beyond that planetary system is the spiritual world, where there are planets called Vaikuṇṭhalokas. Goloka Vṛndāvana is situated above all the Vaikuṇṭhalokas. Goloka Vṛndāvana is the kingdom of Śrīmatī Rādhārāṇī and the parents of Kṛṣṇa, Mahārāja Nanda and mother Yaśodā. In this way there are various planetary systems, and they are all creations of the Supreme Lord.
(Sri Caitanya Caritamrta-----2:23:116------purport).

Sanātana Gosvāmī thus inquired into all phases of devotional service, or Kṛṣṇa consciousness, and Lord Caitanya taught him most confidentially from authoritative scriptures like Śrīmad-Bhāgavatam. The Lord also referred to the Vedic literature known as Hari-vaṁśa, which gives information about the transcendental abode of Kṛṣṇa. This information was disclosed by Indra when he offered his prayers after being defeated upon challenging the potency of Kṛṣṇa. In the Hari-vaṁśa it is stated that although birds and airplanes can fly high in the sky above the earth, they cannot reach the higher planetary systems. The higher planetary systems extend upward from the sun planet, which is situated in the middle of the universe. Above the sun are planetary systems where persons who are elevated by great austerities and penances are situated. The whole material universe is called Devī-dhāma, and above it is Śiva-dhāma, where Lord Śiva and his wife Pārvatī eternally reside. Above that planetary system is the spiritual sky, where innumerable spiritual planets, known as Vaikuṇṭhas, are situated. And above these Vaikuṇṭha planets is Kṛṣṇa's planet, known as Goloka Vṛndāvana. The word goloka means "planet of the cows." Because Kṛṣṇa is very fond of cows, His abode is known as Goloka. Goloka Vṛndāvana is larger than all the material and spiritual planets put together.
(Teachings of Lord Caitanya).

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. Modern materialistic scientists sometimes present themselves as knowing all the ingredients of the sun, yet they are unable to offer a second sun like Mahārāja Priyavrata's.
(Srimad Bhagavatam------5:1:30------purport).

According to the Vedic description of the planetary system, all the planets move from east to west. The sun, the moon and five other planets, such as Mars and Jupiter, orbit one above another. Vāmanadeva, however, expanding His body and extending His steps, occupied the entire planetary system.
(Srimad Bhagavatam------8:21:31------purport).

There are five different names for the orbits of the sun, moon, stars and luminaries in the firmament, and they each have their own saṁvatsara.
The subject matters of physics, chemistry, mathematics, astronomy, time and space dealt with in the above verses of Śrīmad-Bhāgavatam are certainly very interesting to students of the particular subject, but as far as we are concerned, we cannot explain them very thoroughly in terms of technical knowledge. The subject is summarized by the statement that above all the different branches of knowledge is the supreme control of kāla, the plenary representation of the Supreme Personality of Godhead. Nothing exists without Him, and therefore everything, however wonderful it may appear to our meager knowledge, is but the work of the magical wand of the Supreme Lord. As far as time is concerned, we beg to subjoin herewith a table of timings in terms of the modern clock.
One truṭi - 8/13,500 second
One vedha - 8/135 second
One lava - 8/45 second
One nimeṣa - 8/15 second
One kṣaṇa - 8/5 second
One kāṣṭhā - 8 seconds
One laghu - 2 minutes
One daṇḍa - 30 minutes
One prahara - 3 hours
One day - 12 hours
One night - 12 hours
One pakṣa - 15 days
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.
The Brahma-saṁhitā (5.52) affirms this control in this way:
yac-cakṣur eṣa savitā sakala-grahāṇāṁ
rājā samasta-sura-mūrtir aśeṣa-tejāḥ
yasyājñayā bhramati saṁbhṛta-kāla-cakro
govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
"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).

When the sun travels from Devadhānī, the residence of Indra, to Saṁyamanī, the residence of Yamarāja, it travels 23,775,000 yojanas (190,200,000 miles) in fifteen ghaṭikās (six hours).
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------ translation and 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. The demigod Sūrya is always in touch with the Supreme Personality of Godhead, Nārāyaṇa. Residing in outer space, which is in the middle of the universe, between Bhūloka and Bhuvarloka, the sun rotates through the time circle of the zodiac, represented by twelve rāśis, or signs, and assumes different names according to the sign he is in. For the moon, every month is divided into two fortnights. Similarly, according to solar calculations, a month is equal to the time the sun spends in one constellation; two months constitute one season, and there are twelve months in a year. The entire area of the sky is divided into two halves, each representing an ayana, the course traversed by the sun within a period of six months. 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. Above Śukra-graha by 200,000 yojanas is Budha-graha (Mercury), whose influence is sometimes auspicious and sometimes inauspicious. Next, above Budha-graha by 200,000 yojanas, is Aṅgāraka (Mars), which almost always has an unfavorable influence. Above Aṅgāraka by another 200,000 yojanas is the planet called Bṛhaspati-graha (Jupiter), which is always very favorable for qualified brāhmaṇas. Above Bṛhaspati-graha is the planet Śanaiścara (Saturn), which is very inauspicious, and above Saturn is a group of seven stars occupied by great saintly persons who are always thinking of the welfare of the entire universe. These seven stars circumambulate Dhruvaloka, which is the residence of Lord Viṣṇu within this universe.
(Srimad Bhagavatam------5:22------summary).

The sun-god, who is Nārāyaṇa, or Viṣṇu, the soul of all the worlds, is situated in outer space between the upper and lower portions of the universe. Passing through twelve months on the wheel of time, the sun comes in touch with twelve different signs of the zodiac and assumes twelve different names according to those signs. The aggregate of those twelve months is called a saṁvatsara, or an entire year. According to lunar calculations, two fortnights—one of the waxing moon and the other of the waning—form one month. That same period is one day and night for the planet Pitṛloka. According to stellar calculations, a month equals two and one quarter constellations. When the sun travels for two months, a season passes, and therefore the seasonal changes are considered parts of the body of the year.
(Srimad Bhagavatam------5:22:5-----translation).

The sun moves across the zodiac day and night and crosses the oceans between the seven islands one after the other.
(Sri Caitanya Caritamrta-----2:20:387------purport).

Śrī Śukadeva Gosvāmī clearly answered: When a potter's wheel is moving and small ants located on that big wheel are moving with it, one can see that their motion is different from that of the wheel because they appear sometimes on one part of the wheel and sometimes on another. Similarly, the signs and constellations, with Sumeru and Dhruvaloka on their right, move with the wheel of time, and the antlike sun and other planets move with them. The sun and planets, however, are seen in different signs and constellations at different times. This indicates that their motion is different from that of the zodiac and the wheel of time itself.
(Srimad Bhagavatam------5:22:2-----purport).

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. This is confirmed in the Brahma-saṁhitā (5.52) as follows:
yac-cakṣur eṣa savitā sakala-grahāṇāṁ
rājā samasta-sura-mūrtir aśeṣa-tejāḥ
yasyājñayā bhramati sambhṛta-kāla-cakro
govindam ādi-puruṣaṁ tam ahaṁ bhajāmi
"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).

As the spider very easily creates the network of its cobweb and manifests its power of creation without being defeated by others, so also you yourself, by employment of your self-sufficient energy, create without any other's help.
The best example of self-sufficiency is the sun. The sun does not require to be illuminated by any other body. Rather, it is the sun which helps all other illuminating agents, for in the presence of the sun no other illuminating agent becomes prominent. Nārada compared the position of Brahmā to the self-sufficiency of the spider, who creates its own field of activities without any other's help by employment of its own energetic creation of saliva.
(Srimad Bhagavatam------2:5:5-----purport).

Summarizing the entire description of the planetary systems of the universe, Śrīla Viśvanātha Cakravartī Ṭhākura says that one who is able to meditate upon this arrangement as the virāṭ-rūpa, or viśva-rūpa, the external body of the Supreme Personality of Godhead, and worship Him three times a day by meditation will always be free from all sinful reactions. Viśvanātha Cakravartī Ṭhākura estimates that Dhruvaloka, the polestar, is 3,800,000 yojanas above the sun. Above Dhruvaloka by 10,000,000 yojanas is Maharloka, above Maharloka by 20,000,000 yojanas is Janaloka, above Janaloka by 80,000,000 yojanas is Tapoloka, and above Tapoloka by 120,000,000 yojanas is Satyaloka. Thus the distance from the sun to Satyaloka is 233,800,000 yojanas, or 1,870,400,000 miles. The Vaikuṇṭha planets begin 26,200,000 yojanas (209,600,000 miles) above Satyaloka. Thus the Viṣṇu Purāṇa describes that the covering of the universe is 260,000,000 yojanas (2,080,000,000 miles) away from the sun. The distance from the sun to the earth is 100,000 yojanas, and below the earth by 70,000 yojanas are the seven lower planetary systems called Atala, Vitala, Sutala, Talātala, Mahātala, Rasātala and Pātāla. Below these lower planets by 30,000 yojanas, Śeṣa Nāga is lying on the Garbhodaka Ocean. That ocean is 249,800,000 yojanas deep. Thus the total diameter of the universe is approximately 500,000,000 yojanas, or 4,000,000,000 miles.
(Srimad Bhagavatam------5:23:9-----purport).

In Bhagavad-gītā (10.21) Kṛṣṇa says, nakṣatrāṇām ahaṁ śaśī: "Of stars I am the moon." This indicates that the moon is similar to the other stars. The Vedic literature informs us that within this universe there is one sun, which is moving. The Western theory that all the luminaries in the sky are different suns is not confirmed in the Vedic literature. Nor can we assume that these luminaries are the suns of other universes, for each universe is covered by various layers of material elements, and therefore although the universes are clustered together, we cannot see from one universe to another. In other words, whatever we see is within this one universe. In each universe there is one Lord Brahmā, and there are other demigods on other planets, but there is only one sun.
(Srimad Bhagavatam------5:21:11-----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.
The movement of the sun is confirmed in the Brahma-saṁhitā (5.52): yasyājñāya bhramati saṁbhṛta-kāla-cakraḥ. The sun orbits around Mount Sumeru, for six months on the northern side and for six months on the southern. This adds up to the duration of a day and night of the demigods in the upper planetary systems.
(Srimad Bhagavatam------5:20:30-----translation and purport).

In this regard, Śrīla Viśvanātha Cakravartī Ṭhākura says, sūrya ātmā ātmatvenopāsyaḥ. The actual life and soul of all living entities within this universe is the sun. He is therefore upāsya, worshipable. We worship the sun-god by chanting the Gāyatrī mantra (oṁ bhūr bhuvaḥ svaḥ tat savitur vareṇyaṁ bhargo devasya dhīmahi). Sūrya is the life and soul of this universe, and there are innumerable universes for which a sun-god is the life and soul, just as the Supreme Personality of Godhead is the life and soul of the entire creation. We have information that Vairāja, Hiraṇyagarbha, entered the great, dull, material globe called the sun. This indicates that the theory held by so-called scientists that no one lives there is wrong. Bhagavad-gītā also says that Kṛṣṇa first instructed Bhagavad-gītā to the sun-god (imaṁ vivasvate yogaṁ proktavān aham avyayam (B.G.4:1). Therefore the sun is not vacant. It is inhabited by living entities, and the predominating deity is Vairāja, or Vivasvān. The difference between the sun and earth is that the sun is a fiery planet, but everyone there has a suitable body and can live there without difficulty.
(Srimad Bhagavatam------5:20:46-----purport).

In each and every planet there is a predominating deity. It is understood from Bhagavad-gītā that in the sun there is a predominating deity named Vivasvān. Similarly, there is a predominating deity of the moon and of the various planets. Actually the predominating deities in all the other planets are descendants from the predominating deities of the sun and moon. On this planet earth there are two kṣatriya dynasties, and one comes from the predominating deity of the sun and the other from the predominating deity of the moon. These dynasties are known as Sūrya-vaṁśa and Candra-vaṁśa respectively. When monarchy existed on this planet, the chief member was one of the members of the Sūrya dynasty, or Sūrya-vaṁśa, and the subordinate kings belonged to the Candra-vaṁśa. However, Mahārāja Pṛthu was so powerful that he could exhibit all the qualities of the predominating deities in other planets.
(Srimad Bhagavatam------4:22:54-----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).

Time and space are two correlative terms. Time is measured in terms of its covering a certain space of atoms. 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).

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).

The living entities residing on Sumeru Mountain are always very warm, as at midday, because for them the sun is always overhead. Although the sun moves counterclockwise, facing the constellations, with Sumeru Mountain on its left, it also moves clockwise and appears to have the mountain on its right because it is influenced by the dakṣiṇāvarta wind. People living in countries at points diametrically opposite to where the sun is first seen rising will see the sun setting, and if a straight line were drawn from a point where the sun is at midday, the people in countries at the opposite end of the line would be experiencing midnight. Similarly, if people residing where the sun is setting were to go to countries diametrically opposite, they would not see the sun in the same condition.
(Srimad Bhagavatam------5:21:8-9------translation).

And knowledge Now, knowledge, so far our knowledge is concerned, it is very limited. We do not know We can have some experience of our present knowledge, but we do not know what was in the past and what is going to happen in the future. Present also, our knowledge is imperfect. Just like we are seeing the sun daily, but what is our experience? The sun is bigger than this planet, fourteen hundred thousand times bigger. Fourteen hundred thousand pieces of this earthly planet can be thrown into the sun planet, it is so big. Unless it is so big, how it is possible the sun planet is distributing heat and light for millions and millions of years, and although it is situated ninety millions miles?
(Lecture on Srimad Bhagavatam------1:2:1------by Srila Prabhupada).

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).

Mercury is described to be similar to Venus, in that it moves sometimes behind the sun, sometimes in front of the sun and sometimes along with it. It is 1,600,000 miles above Venus, or 7,200,000 miles above earth. Mercury, which is the son of the moon, is almost always very auspicious for the inhabitants of the universe, but when it does not move along with the sun, it forbodes cyclones, dust, irregular rainfall, and waterless clouds. In this way it creates fearful conditions due to inadequate or excessive rainfall.
(Srimad Bhagavatam------4:22:13------translation).

Since the Lord is absolute, deep meditation upon Him is as good as yogic trance. The Lord is nondifferent from His name, form, quality, pastimes, entourage and specific actions. Arjuna began to think of the Lord's instructions to him on the Battlefield of Kurukṣetra. Only those instructions began to eliminate the tinges of material contamination in the mind of Arjuna. The Lord is like the sun; the sun's appearance means immediate dissipation of darkness, or ignorance, and the Lord's appearance within the mind of the devotee can at once drive away the miserable material effects. Lord Caitanya has therefore recommended constant chanting of the name of the Lord for protection from all contamination of the material world. The feeling of separation from the Lord is undoubtedly painful to the devotee, but because it is in connection with the Lord, it has a specific transcendental effect which pacifies the heart. Feelings of separation are also sources of transcendental bliss, and they are never comparable to contaminated material feelings of separation.
(Srimad Bhagavatam------1:15:28-----purport).