Comets: Between Omens and the Memory of the Cosmos

“Ketu” in the Vedas, the Nārada Purāṇa, the Mahābhārata, and the Bṛhat Saṁhitā, in the light of modern astronomy

Before the great battle of Kurukṣetra, the sage Vyāsa described to King Dhṛtarāṣṭra a series of disturbing celestial phenomena. The planets were in unusual positions, some stars appeared dimmed, and A terrifying comet seemed to dominate the nakshatra Puṣya. Those signs were interpreted as omens of the destruction that would befall the two armies.

Thousands of years later—at least according to the traditional chronology of events in the Mahābhārata—we find a very different scene in another part of the world. Some Magi from the East see an unusual star and decide to follow it, recognizing it as a sign heralding the birth of a great king. Christian tradition would later depict that star as a comet, turning it into one of the most recognizable symbols of Christmas.

Two very different stories, yet united by a similar idea: a celestial phenomenon appears at a particularly important moment in human history.

Comets have always held a special fascination. Unlike stars, which maintain their relative positions, and the Grahas, whose movements can be tracked and calculated mathematically, comets seemed to appear suddenly. Some remained visible for just a few nights, while others traversed the sky for weeks or months. They could be white, red, or golden, and might have a single tail or much more complex branching tails. It is no surprise that ancient observers sought to understand both their nature and their significance.

In the Jyotiṣa tradition, comets play an important role, especially in the branch of Saṁhitā (Mundane Astrology), which is also dedicated to the study of celestial phenomena in relation to collective events, nations, harvests, climatic conditions, and rulers. However, these phenomena can also be analyzed as Gochara, or transits, when superimposed on our natal chart.

A particularly meaningful lesson can be found in the Nārada Purāṇa, which in Chapter 56 devotes an entire section to the Ketu-cāra (which literally means “the movement of Ketu” or “the movements of the Ketus”), in which the appearance of the Ketus is studied. Here, “Ketu” is to be understood in the plural and does not refer to the lunar node we commonly know as Ketu, but rather identifies comets and other celestial bodies that appear and disappear in the sky very quickly. This knowledge is further developed in the Bṛhat Saṁhitā by Varāhamihira, one of the most important treatises on Jyotiṣa in classical and medieval India.

But today we also have another option. We can study these same phenomena through physics, understand what they are made of, why they develop a tail, and how they relate to the formation of the Solar System.

Ketu: The Banner of Smoke

The Sanskrit term ketu has several meanings. It can refer to a banner, a distinctive mark, a signal, or a luminous phenomenon. In Jyotiṣa, we are accustomed to recognizing Ketu as the descending lunar node, opposite Rāhu, but in Sanskrit literature, the term is not limited to this meaning. And in Mundane Astrology, especially when we encounter it in its plural form, it refers to the group of celestial phenomena we are discussing.

The word is particularly interesting dhūmaketu, consisting of dhūma, smoke, and ketu, banner. We could translate it literally as «the one who carries a banner of smoke». It is a very evocative description of a comet, whose luminous nucleus may be accompanied by a long tail that seems to fade into space. Symbolically, it is like a messenger holding a banner in his hand as he races to deliver his message to Earth.

The term appears as early as in the Ṛgveda 1.44.3, where it is used to describe Agni:

adyā dūtaṃ vṛṇīmahe vasum agniṃ purupriyam | dhūmaketuṃ bhāṛjīkaṃ vyuṣṭiṣu yajñānām adhvaraśriyam

«Today we choose Agni as our messenger, the bestower of riches, beloved by many, the one who carries the banner of smoke, », the radiance and splendor of the sacrifices at the break of dawn.".

In this context, Dhūmaketu is an attribute of Agni, the sacrificial fire. Where there is fire, there is also smoke.

Another reference can be found in the’Atharvaveda 19.9.10:

"May there be peace—the months, the sun, and the moon; may there be peace—the sun and the moon; may there be peace—death" dhūmaketuḥ śaṃ rudrās tigmatejasaḥ

The verse invokes the protection and benevolence of the celestial powers, mentioning the Grahas, the Moon, the Sun, Rāhu, Mṛtyu, and Dhūmaketu.

Here, the relationship between Dhūmaketu and Mṛtyu, death, is particularly evocative. The Sanskrit construction can be interpreted in different ways: as a reference to a Dhūmaketu associated with death, or as an epithet for Mṛtyu herself, bearing a banner of smoke—probably in reference to the funeral pyre on which the deceased are cremated.

The association between smoke, light phenomena, and transformation is a very ancient one.

The Nārada Purāṇa and the Three Categories of Ketu

In the Nārada Purāṇa, Pūrva-bhāga, Chapter 56, the section Ketu-cāra It covers ślokas 92–108.

The text explains that the Ketu (comets) can take on different forms and that their appearance is associated with either favorable or unfavorable consequences. The first distinction concerns three categories: Divya, Āntarikṣa, and Bhauma.

I Ketu Divya (of the sky, of light, of space, of the Devas) are the celestial ones, observed in the regions of the stars and the Nakṣatras. The Āntarikṣa (intermediate) belong to the intermediate realm and include luminous apparitions associated with forms such as banners, weapons, buildings, chariots, trees, or animals. The Bhauma (terrestrial) are, on the other hand, phenomena observed in relation to the Earth's surface.

So there are Ketus that come from the stars, Ketus that come from Earth's atmosphere, and Ketus that come from Earth.

Therefore, this classification is much broader than modern astronomical classification. Not all phenomena called Ketu can be identified with the icy bodies we now call comets. Ancient authors grouped various luminous phenomena into this category, observing and interpreting them according to the knowledge of their time.

Spheres of light, atmospheric phenomena, and wonders may still fall under the category of Ketu. It is likely that the ancients referred to Ketu as all unidentified, multidimensional, or infradimensional phenomena—what we now call UAPs.

In ślokas 95–96, we find a particularly interesting principle. The text states that Ketu can manifest in different forms and links the duration of its visibility to the duration of the effects attributed to its appearance.

The general rule is that: A certain number of days of visibility corresponds to the same number of months of effects, while the months of visibility can stretch into years. If a comet lasts 3 days, its effect will last 3 months. If the comet remains in the sky for 2 months, then its effect will last 2 years.

This criterion is very useful from an interpretive standpoint for understanding how long-lasting the effect will be in the country where Ketu is visible and how significant that effect will be.

A modern phenomenon. An alleged UFO or UAP sighting—whether of an “Orb” or any other transient phenomenon in the sky (whether explainable or unexplainable)—can therefore be interpreted using this logic from an astrological perspective. If we can determine its duration and the area of the sky (Rāśi and Naksatra) where the phenomenon occurred, it becomes a messenger. The phenomenon is telling us something and is indicating how long that something will influence our lives. It is interesting to note the etymology of the word “angel.” An angel is, by definition, a “messenger” (from the Greek ánghelos and the Hebrew mal’akh). Thus, we can say that Ketu is also a messenger bearing a message, whether favorable or unfavorable.

The Nārada Purāṇa tells us that a short, bright, clear, and white comet may be associated with favorable rains, while a long, irregular, or rainbow-like comet is interpreted differently. Comets with two, three, or four tails are considered particularly ominous.

Even from these early descriptions, we can see that, traditionally, not all comets are considered bad omens. Some herald abundance, while others portend hardship. It is therefore their specific appearance that determines how they are interpreted. Meanwhile, their duration determines the temporal significance of their effects.

The Children of the Grahas: All the Comets Associated with the Planets

One of the most fascinating aspects of this tradition is the classification of Ketu according to the Grahas. This correlation allows us to interpret comets based on their astrological significators and thus to apply this information in the study of mundane charts or to understand the effects of their transits on natal charts.

We find the classification of Ketu in the Nārada Purāṇa 56.99–106 and, in much greater detail, in the Bṛhat Saṁhitā 11.10–28 of Varāhamihira. Varāhamihira studied many ancient texts, including the *Nārada Purāṇa* itself, and tells us that he gathered all this information from it.

Thus, comets are described as the children of the Sun, the Moon, Mars, Mercury, Jupiter, Venus, and Saturn. There are also categories associated with Rāhu and other cosmic deities.

The expression «children of a planet» does not refer to a description of their physical origin. A comet does not physically originate from Mars or Venus. It is an astrological and symbolic classification in which certain visible characteristics of the comet are associated with the qualities and functions of a particular Graha.

Let's look at all the main planetary categories, comparing the two texts.

1. Sun (Sūrya) — Kiraṇa Ketu and Aruṇa Ketu. Varāhamihira describes twenty-five Kiraṇa Ketu, as luminous as garlands, gems, or gold, with tails, and visible in the eastern and western directions. Their appearance is associated with conflicts between sovereigns (Bṛhat Saṁhitā 11.10). In the Nārada Purāṇa 56.99, we find the same association between comets shining like jewels and challenges for government officials. The Purāṇa also attributes the Aruṇa Ketu to the Sun, describing them as dark and inauspicious (56.106). Varāhamihira, on the other hand, associates the Aruṇa Ketu with Vāyu, the wind, and distinguishes seventy-seven of their manifestations (11.24). This is an important difference between the two sources.
2. Moon (Candra) — The white and luminous I Ketu. The Nārada Purāṇa 56.101 describes comets born of the Moon as white and associated with the prosperity and to the peace of mind. Varāhamihira compares them to the brightness of the moon, silver, snow, jasmine, and the white water lily. They are observed in the northern region of the sky and are considered in favor (Bṛhat Saṁhitā 11.14). In this case, the clear brightness and the color white take on a positive and joyful meaning.
3. Mars (Maṅgala) — Kauṅkuma or Kuṅkuma Ketu. The Nārada Purāṇa 56.105 describes these comets as red and spear-like. Varāhamihira distinguishes sixty of them, blood-red or fire-like in color, characterized by three tails and associated with the northern direction (Bṛhat Saṁhitā 11.21). The following are considered adverse. Their appearance is associated with the astrological characteristics of Mars, particularly its fiery and combative nature.
4. Mercury (Budha) — Taskara Ketu. In the Nārada Purāṇa 56.104, we find small, slender, white comets associated with the risk of theft and disease. Varāhamihira calls them Taskara Ketu; he identifies fifty-one of them and describes them as dim, difficult to observe, elongated, and white. They can appear in any direction and are considered adverse (Bṛhat Saṁhitā 11:20). The term taskara It means "thief" and directly refers to one of the consequences attributed to these apparitions.
5. Jupiter (Guru or Bṛhaspati) — Vikacā Ketu. They are white, luminous comets with no visible tail and characterized by a single luminous region. Varāhamihira identifies sixty-five of them, which appear mainly in the southern sky and, according to the text, produce results adverse (Bṛhat Saṁhitā 11.19). The Nārada Purāṇa 56.104 confirms this association. It is interesting to note how a naturally benefic planet like Jupiter can be associated with a category of Ketu that is considered unfavorable. This reminds us that we cannot automatically apply the beneficial or malefic nature of the planet to the interpretation of the comet. However, we can say that Jupiter will always bring a profound lesson and provide spiritual assistance.
6. Venus (Śukra) — Bhārgava's I Ketu. In the Nārada Purāṇa 56.103, white comets are described as appearing in the northeastern direction and are considered adverse. But in śloka 106, the same text mentions that when comets born of Venus resemble stars, they instead bring favorable results. For example, in the Gospel as well, the comet is described as a star. Varāhamihira distinguishes eighty-four Ketus associated with Venus, characterized by great white brightness, visible in the north and northeast, and attributes unfavorable consequences to them (Bṛhat Saṁhitā 11.17). This distinction shows that a single planetary origin can give rise to manifestations with different nuances, which, based on these nuances, must be interpreted in different ways.
7. Saturn (Śani) — Kanaka Ketu. The Nārada Purāṇa 56.103 describes comets with two points or tails, associated with Saturn and called Kanaka. Varāhamihira identifies sixty of them, each with two tails, luminous, and capable of appearing in any direction (Bṛhat Saṁhitā11.18). Despite its name kanaka, which means "gold"; these events are considered particularly unfavorable. In the traditional classification, they are one of the most feared categories.
8. Rāhu — Tāmasa and Kīlaka Ketu. Varāhamihira describes thirty-three manifestations associated with Rāhu, called Tāmasa and Kīlaka, which appear as spots on the disks of the Sun and the Moon (Bṛhat Saṁhitā 11.22). They do not necessarily correspond to comets in the modern astronomical sense. Their inclusion demonstrates once again just how broad the category of Ketu was in the Saṁhitā. What causes these spots? This is an interesting topic to explore further.

This classification is invaluable for the study of Jyotiṣa. Indeed, we see how Varāhamihira distinguishes hundreds of celestial phenomena based on characteristics that can actually be observed: color, shape, the presence or absence of a tail, brightness, and direction. Thus, nuances matter, and the ancient Vedic astrologer learned to observe celestial phenomena with great care.

It is the combination of the nature of the phenomenon, the associated Graha, the celestial position, and the visible manifestation that must be taken into account.

Ketu in association with other deities

The classification does not end with the Grahas. Varāhamihira also describes numerous manifestations associated with Agni, Yama, Vāyu, Varuṇa, Brahmā, Prajāpati, and the Earth.

Among these are the Viśvarūpa Ketu, associated with Agni, whose shapes resemble a blazing fire or a glowing garland. Varāhamihira identifies 120 of them and associates their appearance with the fire hazard (Bṛhat Saṁhitā 11.23).

But the Nārada Purāṇa 56.105 provides a different interpretation: the Viśvarūpa Ketu, although associated with Agni and the color of fire, are considered bringers of happiness.

This difference deserves to be preserved and studied. The two sources provide similar descriptions, though their interpretations are not always identical. We can say that fire can blaze and destroy, but in a spiritual culture, fire becomes the sacred medium of Vedic sacrifice, which opens the way to transcendence. Therefore, the perspective from which something is studied is always important for interpretation. An astrological aspect may be favorable in one area of life but unfavorable in another. Comets associated with Agni may, for example, be unfavorable in terms of fires, but they may favor the Brahmins who perform the sacrifices.

The Nārada Purāṇa also mentions the Brahmadaṇḍa, a symbol featuring three colors and three points, attributed to Brahmā and considered extremely unfavorable. Varāhamihira provides a similar description in śloka 11.15.

Another category is that of the Ketu associated with Earth, round and shiny like water or oil. The Nārada Purāṇa associates them with the famine and fear.

These descriptions must be read from the perspective of the ancient observer who gazed at the sky with great attention. For him, a round shape, a multiple tail, or a particular brightness were not merely characteristics of the object, but actual signs to be interpreted within a broader understanding of cosmic correspondences. It is a way of seeing that we have now lost because we look at things without attributing any weight or meaning to them anymore.

Kaumuda, Āvarta, and Auspicious Comets

In the Nārada Purāṇa 56.108, we find a particularly interesting comet: the Kaumuda Ketu, described as resembling a white lily and associated with the prosperity e to abundance.

Varāhamihira describes a very similar phenomenon, called Kumuda Ketu, in verse 11.43. It appears in the west, with its tail pointing east; it remains visible for only one night and is associated with a long period of prosperity.

Also in the Nārada Purāṇa 56.108, the’Āvarta Ketu, which is considered inauspicious when it appears at twilight with three points. Varāhamihira, on the other hand, describes in śloka 11.50 a Red Ketu Āvarta, a bright star, observed toward the west around midnight, to which he attributes favorable outcomes.

These statements are not contradictory. The two descriptions have different characteristics, particularly in terms of when they appear and their form. They refer to distinct phenomena belonging to the same category, even though they have very similar names. Here, it is the time at which they occur that is crucial to their interpretation.

Among the other favorable Ketu positions described by Varāhamihira, we find the Maṇi Ketu, with a white, straight tail, the Jala Ketu, which is radiant and associated with prosperity, and the Padma Ketu, compared to the white of the lotus stem.

These positive examples are particularly important because they prevent us from reducing Ketu to mere harbingers of misfortune. There are comets that serve as messengers of positivity.

Comets in the Mahābhārata

Let's now return to the scene with which we began this article.

In Mahābhārata, Bhīṣma Parva 6.3.12, Vyāsa describes to King Dhṛtarāṣṭra a Dhūmaketuparticularly disturbing:

dhūmaketur mahāghoraḥ approaches Puṣya and remains there

«A terrible comet is occupying Puṣya.».

The next line foretells an unfavorable outcome for both armies, which are about to face off in the most significant war of antiquity.

What we need to focus on is the reference to a specific nakshatra. This celestial phenomenon is described not only in terms of its brightness or shape, but also in terms of its position in the sky. So here, in addition to the time factor, we have the spatial factor. Where is this particular Ketu located in relation to the sidereal zodiac?

Puṣya It is traditionally considered a particularly auspicious nakshatra and is associated with nourishment, protection, and spiritual growth. This is because its devata is Brhaspati, the guru of the devas. Puṣya is also located in the sign of Cancer, which is ruled by the Moon.

The presence of a Dhūmaketu described as terrifying thus takes on a particularly unsettling meaning in the context of the story.

There are two main royal dynasties in the Vedic historical narratives: the Dynasty of the Sun and Moon Dynasty. Rāma was born into the Sun Dynasty. Meanwhile, the family that would fight in the great war was descended from the Moon Dynasty. Thus, an ominous comet in Cancer—a sign ruled by the Moon—heralded danger for the entire dynasty.

The chapter goes on to describe other celestial phenomena, the positions of the Grahas, and unusual luminous phenomena. Some interpreters have proposed alternative astronomical identifications: Dhūmaketu It can be interpreted as a comet, while some exegetical traditions also associate it with a particular Upagraha (sub-planet or secondary planet). But the comet hypothesis is much more plausible because the Upagrahs are mathematical points and not phenomena visible in the sky. Vyasa would have had to create a chart of that moment to see if the Upagraha Dhūmaketu was actually in Puṣya, whereas the chapter instead describes phenomena that were being observed in the sky, in the atmosphere, and on Earth.

One principle, however, remains clear: even in the narrative of the Mahābhārata, celestial phenomena are linked to the Nakṣatras and to events affecting entire kingdoms. This is one of the foundations upon which Saṁhitā Jyotiṣa, or Mundane Astrology, is built.

The Ketus at the Birth of Hiraṇyākṣa and Hiraṇyakaśipu

Even the Śrīmad-Bhāgavatam 3.17.4 It provides a very insightful description.

When Diti gives birth to the two Asuras (dark-hearted, narcissistic sociopaths) Hiraṇyākṣa and Hiraṇyakaśipu, the text describes a series of disturbing phenomena: the Earth trembles, the cardinal directions seem to burst into flames, and meteors, lightning, and Ketu appear in the sky.

sahācalā bhuvaś celur diśaḥ sarvāḥ prajajvaluḥ | solkāś cāśanayaḥ petuḥ ketavaś cārti-hetavaḥ ||

«The Earth trembled along with the mountains; every direction seemed to be ablaze; meteors and lightning fell, and Ketu, the bringers of suffering, appeared.».

This reference is also interesting from a linguistic perspective. The text distinguishes between ulkāḥ, meteors, from ketavaḥ, comets, or other luminous phenomena. Therefore, it is not necessarily the same phenomenon.

In Śrīla Prabhupāda’s translation and commentary, this verse is interpreted as the manifestation of unfavorable signs at the time of the two Asuras’ birth. So once again, this is a message conveyed to us through signs.

It is particularly interesting to observe the relationship between celestial phenomena and the birth of beings destined to play an important role in the cosmic events recounted in the Purāṇa—whether positive or negative. When a great, luminous personality is born who will bring positivity, the omens will be positive. When a Hitler is born on Earth, the omens will be negative.

Was the Star of Bethlehem a comet?

Continuing along these lines, one of the best-known depictions of a comet is the one associated with the birth of Jesus, which thus symbolizes the birth of a great figure.

In the Gospel according to Matthew 2:1–12, some Magi from the East recount that they had seen a star and had come to Jerusalem to seek the newborn King of the Jews. The star is later described as going before them and seeming to stop over the place where the child was.

But the Gospel does not explicitly mention a comet with a tail, a particular color, or a luminous coma. The identification with a comet becomes increasingly prominent in later interpretations.

One of the main people responsible for spreading this image was Giotto di Bondone.

In 1301, during a passage of Halley’s famous comet, Giotto likely had the opportunity to observe this extraordinary phenomenon. A few years later, while creating the’Adoration of the Magi In the Scrovegni Chapel in Padua, he depicted the Star of Bethlehem as a real comet, with a luminous head and a long tail.

The connection between Giotto and Halley's Comet became so significant that the European Space Agency decided to name Giotto the space probe that reached the comet in 1986 and photographed its nucleus.

But there is also an astronomical theory regarding the birth of Jesus.

Chinese astronomers recorded a comet in 5 B.C., which remained visible for over seventy days. In 1991, Colin Humphreys proposed that this object might be connected to the Star of Bethlehem described by Matthew.

According to this hypothesis, the comet would have appeared at a time consistent with certain chronological reconstructions of Jesus’ birth. Its apparent motion could have contributed to the interpretation of the star that guided the Magi.

However, this identification has not been proven. Other scholars have proposed different astronomical phenomena, including planetary conjunctions, or primarily theological interpretations of the story.

What interests us most is the meaning attributed to this celestial phenomenon. In the *Mahābhārata*, the comet is an omen of a devastating conflict; in Christian tradition, however, a star—later depicted as a comet—marks the birth of a great spiritual teacher.

Furthermore, if the comet remained visible for more than 70 days, then, according to Nārada, the effect would have lasted for more than 70 months.

So, as we have seen in the Vedic texts, not all celestial signs are interpreted in the same way. Different comets produce different results.

The Comet as an Image of Kalki

A very beautiful reference—this time from Vaiṣṇava devotional literature—can be found in the Gīta Govinda by Jayadeva, composed in the 12th century.

In the famous *Daśāvatāra Stotra*, Jayadeva describes Kalki, the Avatāra who appears at the end of the Kali-yuga, using the very image of Dhūmaketu:

mleccha-nivaha-nidhane kalayasi karavālaṃ dhūmaketum iva kim api karālam | keśava dhṛta-kalki-śarīra jaya jagadīśa hare ||

Jayadeva compares Kalki's fearsome appearance, armed with a sword, to that of a comet.

It is a poetic and spiritual metaphor. The comet becomes a symbol of a powerful, sudden event, capable of heralding the end of one order and the beginning of another.

It is interesting how the same phenomenon can be used to represent a cosmic transformation—not necessarily just a disaster.

Varāhamihira and the Ketu-cāra of the Bṛhat Saṁhitā

We now turn to Varāhamihira, a 6th-century author, who in the Bṛhat Saṁhitā He collected and organized a vast amount of knowledge about natural and celestial phenomena.

Chapter 11, Ketu-cāra, is entirely dedicated to Ketu.

In the first verse, Varāhamihira states that he has studied the teachings of Garga, Parāśara, Asita, Devala, and other masters. His work thus presents itself as a synthesis of earlier knowledge.

In the second line, he writes:

Is darśanam astamayo, or is it impossible to know it through the method of calculation?

«His appearance or disappearance" not »can be determined using the methods of astronomical calculation.".

This statement must be understood in the context of the knowledge of the time. Indian astronomers already had sophisticated mathematical tools for studying the movements of the Grahas and predicting eclipses. Comets, on the other hand, represented a category of phenomena that was much more difficult to calculate.

Today, we can calculate the orbits of many comets using the laws of gravity and increasingly precise observations. But in ancient times, a large comet might have seemed like a completely unexpected phenomenon.

Varāhamihira also takes up a particularly significant discussion regarding the number of Ketus. Some masters recognized 101, others 1,000, while Nārada maintained that there was only one Ketu, capable of manifesting in many forms. In the Bṛhat Saṁhitā 11.5 We find:

"There is only one form," said the sage Nārada to Ketu.

«The sage Nārada stated that there is only one Ketu, even though he manifests in many forms.».

The connection to the teaching preserved in the Nārada Purāṇa is evident. Nārada’s statement does not indicate the existence of a single astronomical body; rather, he is expressing the idea of a general category of phenomena that takes on multiple manifestations.

Varāhamihira does not attempt to definitively resolve the question of the number of comets. He prefers to focus on observing them: when they appear, how long they remain visible, what color they take on, in which directions they are located, and with which Nakṣatra they seem to be associated.

This is an important methodological choice because it reminds us that every astrological interpretation should begin with a careful observation of the phenomenon. Categories are useful frameworks that help us make useful classifications, but we must be careful not to become trapped within them.

The Nakshatras and the Karma of Nations

Another particularly interesting section of the Bṛhat Saṁhitā It can be found in śloka 11.53–60, where Varāhamihira relates comets to the nakshatras and to various regions.

It describes situations in which a comet’s tail appears to pass through or obscure the stars belonging to a particular Nakṣatra. These configurations are said to have consequences for the rulers of specific kingdoms.

For example, Kṛttikā is associated with the ruler of Kaliṅga, Rohiṇī with Śūrasena, Citrā with the Kurus, and Svāti with the territories of Kāśmīra and Kāmboja.

It is clear that these associations are part of the historical geography of ancient India. We cannot automatically apply them to modern states without studying the geographical correspondences, the context of the sources, and the astrological principles used.

But this shows us just how advanced the branch of Saṁhitā Jyotiṣa was, in which celestial phenomena were studied in relation to collective events.

Śloka 11.52 is also interesting, in which Varāhamihira considers The effects of certain comets on people whose natal nakshatra is affected by the phenomenon.

Therefore, the Ketu-cāra does not pertain exclusively to rulers and nations, but can also be related to the study of the individual chart.

Of course, from an astronomical standpoint, when a comet appears to pass through a Nakṣatra, it does not mean that it actually comes into contact with those stars. The stars are located at vastly greater distances. This is a perspective overlap observed from Earth, just as happens when we see a planet pass through a specific region of the zodiac. But you already know this very well.

From the perspective of Jyotiṣa, however, it is precisely that apparent position that constitutes one of the elements of the interpretation.

What is a comet really made of?

Let's now turn to the physics of comets, while maintaining the connection to the characteristics observed by the ancients.

For a long time, these objects were described as large balls of dirty snow. The image is intuitive, but today we know that their nature is much more complex.

The core of a comet is the core, a solid body generally ranging in size from a few hundred meters to several kilometers, composed of ice, dust, rocky material, and organic compounds. The ice contains water, carbon dioxide, carbon monoxide, and other volatile substances.

When a comet is in the outermost regions of the Solar System, it may be relatively inactive. But as it approaches the Sun It begins to receive an increasing amount of energy.

Solar heat causes some of the ice to sublimate, passing directly from the solid to the gaseous state. The released gases carry dust particles and other materials with them, creating a large temporary atmosphere around the nucleus, called a coma or coma.

At this point, a spectacular transformation takes place: a body that initially measured only a few kilometers in size expands to a cloud of gas and dust extending for tens or hundreds of thousands of kilometers. Some of these materials are then dispersed into space, forming the characteristic tail, which can reach lengths of millions of kilometers.

And it is interesting to find the Vedic term here, at least in terms of imagery Dhūmaketu: the banner of smoke. Of course, a comet is not made up of smoke produced by combustion, as in the case of earthly fire, but of gases and dust released from its nucleus. Yet the analogy is powerful: smoke—gas.

So when we observe a large comet, most of what we see is not its nucleus, but the material it is gradually releasing into space. In a sense, the comet becomes visible through its own transformation.

The Two Tails and the Solar Wind

Contrary to what one might imagine, a comet does not necessarily have just one tail. The two main components have different physical origins.

La dust trail It consists of small solid particles released from the nucleus. These particles reflect sunlight and are affected by the pressure of solar radiation. The tail often appears whitish or yellowish and can take on a curved shape.

La ionic tail, on the other hand, consists of ionized gas—that is, electrically charged atoms and molecules. These particles are influenced by the solar wind and the interplanetary magnetic field, forming a structure that is generally thinner and more linear, extending in the direction opposite the Sun. It often appears blue, mainly due to the light emitted by certain molecular ions.

It is important to understand that the tail does not necessarily lie behind the comet relative to its direction of motion. Its orientation depends mainly on its interaction with the Sun. For this reason, when a comet moves away from the Sun, the tail may even lie in front of the nucleus relative to its trajectory.

Tails can also change their appearance relatively quickly. Variations in the solar wind and the magnetic field can distort the ion tail and, under certain circumstances, even cause it to temporarily detach from the nucleus.

Let us now return to the descriptions in the Nārada Purāṇa and by Varāhamihira. When they distinguish Ketu as having straight, curved, double, or multiple tails, they describe a variety of celestial phenomena that we can today relate, at least in part, to different physical processes.

We cannot with certainty correlate every ancient category with a specific modern cometary structure, but the comparison shows just how important visual details were. And besides, not all Ketus are comets, as we have already mentioned.

The Color of Comets: From Ancient Observations to Spectroscopy

Astrological sources also attribute special significance to colors. They speak of comets that are white, red, dark, golden, fire-like, silver-like, or flower-like.

Modern science allows us to understand how these differences arise.

Dust particles reflect sunlight and can appear in different colors depending on their properties and the viewing conditions. The gases in the coma and tail, on the other hand, can absorb energy from solar radiation and emit light at certain wavelengths.

Certain emissions of diatomic carbon, for example, can give the corona a green hue. The carbon monoxide ion, CO⁺, on the other hand, contributes to the characteristic blue color of many ion tails. Other molecules, dust, and lighting conditions produce additional variations.

Today, we use spectroscopy to analyze this light, break it down into its different wavelengths, and identify the substances present. A comet’s light therefore contains information about its chemical composition.

A modern astronomer can observe a blue tint and look for emissions from the ions responsible for it. Observers in ancient India observed visible characteristics and placed them within a different interpretive framework.

The subject matter is the same. What differs are the tools, the knowledge, and the questions posed about the phenomenon.

Comets preserve the memory of the Solar System's formation

Modern science has revealed an aspect of comets that, personally, I find even more fascinating than their appearance in the sky.

Many of them contain material dating back to the early stages of the Solar System’s formation, about 4.6 billion years ago. As the Sun and the planets were forming from a vast cloud of gas and dust, some of the material became incorporated into small icy bodies, some of which were subsequently scattered to the farthest reaches of the Solar System.

Today, we distinguish between different populations of comets. Many short-period comets are associated with populations of icy bodies located beyond Neptune, while numerous long-period comets likely originate from the distant Oort Cloud, a vast reservoir of icy bodies believed to surround the Solar System.

The Oort Cloud has not yet been directly observed, but its existence is inferred from the orbital characteristics of long-period comets. Some of these bodies can take thousands, hundreds of thousands, or even millions of years to complete one orbit around the Sun.

Let's think about what all this means.

A comet may have spent an immense amount of time in the cold, dark regions of the Solar System, preserving ancient materials. Then a gravitational disturbance alters its trajectory and sends it toward the Sun. When it gets close enough, the heat begins to release the material it has been holding onto, making it observable.

It is as if a fragment of the earliest history of our planetary system were suddenly visible in the sky.

Rosetta: When Humans Reached a Comet

One of the most important chapters in modern research was written by the European Rosetta mission.

In 2014, the ESA probe reached Comet 67P/Churyumov–Gerasimenko, observing it up close as it moved along its orbit. The small Philae lander also managed to reach the comet’s surface.

The images revealed a surprising world: an irregularly shaped core consisting of two large lobes connected by a narrower region, with walls, depressions, boulders, dust-covered surfaces, and areas from which jets of gas and particles were escaping.

The core measures about four kilometers along its longest axis and is extremely porous. Its average density, about 533 kilograms per cubic meter, is much lower than that of liquid water. It is therefore a relatively fragile body, whose structure contains a large number of voids.

But the most surprising discoveries concern its chemical composition.

Rosetta has detected a wide variety of molecules, including water, carbon monoxide, carbon dioxide, organic compounds, and even molecular oxygen. Glycine, an amino acid, and phosphorus—an element important for Earth’s biological systems—have also been identified.

This does not mean that life has been discovered on the comet. It does mean, however, that these ancient celestial bodies may preserve chemicals that are important for understanding the processes that preceded the emergence of life on Earth.

Scientists have long been studying the possibility that comets and asteroids may have helped bring water and organic molecules to our planet. The question remains open, and the relative contributions of the various celestial bodies have not yet been fully clarified.

However, one extraordinary fact remains: some of the matter that makes up our world may have a history closely linked to that of the small celestial bodies that travel through the Solar System.

A comet is not just a luminous phenomenon. It is ancient matter that transforms, interacts with the Sun, and allows us to study the conditions under which the planets were formed.

A comet from another star

In 2025, astronomers identified an even more unusual visitor: the interstellar comet 3I/ATLAS. Even in esoteric circles, there has been much talk about this comet, with a wide range of theories. It has therefore sparked great interest.

Unlike ordinary comets in the Solar System, this body follows a hyperbolic orbit, indicating that it originated in interstellar space. It is not an object permanently bound to the Sun, but a visitor passing through our planetary system before moving away from it.

Observations from the James Webb Space Telescope have made it possible to study its composition, revealing a coma particularly rich in carbon dioxide and chemical characteristics that differ from those of many comets in our Solar System.

Subsequent analyses of carbon and hydrogen isotopes provided further clues about the conditions under which this object may have formed.

This discovery further broadens our perspective. Some comets not only preserve the memory of our Sun’s birth, but may also contain materials formed in completely different stellar environments.

Astronomers in ancient times observed comets whose origins and return periods could not be calculated using the instruments available at the time. Today, we are able to reconstruct many of their orbits and, in some cases, even determine that a celestial body originates from another star system.

However, the ability to predict a comet's path does not diminish the fascination of its appearance. It simply allows us to understand it more deeply.

Can comets physically affect the Earth?

This question deserves further examination, because it allows us to distinguish between what belongs to physics and what is interpreted through the astrological tradition.

Comets are not just distant, luminous objects. They are physical bodies that interact gravitationally with the rest of the Solar System and, as they pass through it, release gas and dust into space.

Some of the meteor showers we observe each year are the result of the Earth colliding with debris left behind by comets along their orbits.

The Perseids, for example, originate from material released by Comet 109P/Swift–Tuttle. When Earth passes through this region, tiny particles enter the atmosphere at high speeds, producing the bright trails we call shooting stars.

There is, therefore, a real physical interaction between Earth and the material left behind by comets. In much rarer circumstances, a cometary body could even collide with a planet, with significant consequences.

However, the mere visible appearance of a comet does not necessarily have a significant physical effect on Earth. And there is no established scientific research indicating that the color or direction of its tail can cause wars, famines, or political changes.

This does not prevent us from studying the interpretations handed down by Jyotiṣa, but it does encourage us to carefully distinguish between the different levels of knowledge. On the one hand, we have measurable physical phenomena; on the other, a traditional system for interpreting celestial signs, which deserves to be studied within its historical and symbolic context.

Comets and Collective Karma

Let us now return to the Saṁhitā Jyotiṣa, or mundane astrology.

To apply the teachings of the Nārada Purāṇa and the Bṛhat Saṁhitā today, it would not be enough to simply observe the appearance of a comet in general terms and attribute a favorable or unfavorable meaning to it.

We should first understand its characteristics, compare them with traditional classifications, and study the region of the sky in which it appears. The Rāśi, the Nakshatra, the duration of visibility, the direction of the tail and any apparent relationships with the Grahas become fundamental elements.

When studying nations, we can then explore the geographical correspondences of the nakshatras, the Nation Charts, and the chart for Chaitra Śukla Pratipadā, assessing how this phenomenon fits into the overall astrological picture.

For individual analysis, we can consider the relationship with the natal chart, particularly with the relevant nakshatras and the grahas that occupy or rule them.

These are applications that require an advanced knowledge of Jyotiṣa and should not be confused with an automated prediction of events. The tradition itself teaches us that No phenomenon should be interpreted in isolation.

We must also bear in mind that the geographical and social classifications in the Saṁhitā belong to a specific historical context. Before applying them to contemporary nations, we must fully understand the sources and the original meaning of the territories described.

The study of comets thus becomes an opportunity to explore the relationship between individual karma and collective karma, but also to cultivate a quality essential to every student of Jyotiṣa: the ability to observe without jumping to conclusions.

The Comet and Change

I would like to conclude by returning to an aspect that ancient tradition and modern science have in common.

The Nārada Purāṇa and Varāhamihira attach great importance to the changing characteristics of comets: their color, shape, direction, duration of visibility, and the appearance of one or more tails.

From the perspective of modern science, a comet is truly a body in a state of transformation. As it approaches the Sun, its nucleus loses material, develops a coma, generates tails that are constantly changing, and may eventually fragment or disintegrate. Every close pass by the Sun alters, at least in part, its physical structure.

The changes that the ancients observed in the sky therefore correspond to a real natural process, even though this does not prove the astrological consequences they associated with it.

In the philosophical language of Sāṁkhya, we might recognize this phenomenon as a manifestation of Prakṛti, the ever-changing material nature. A statement on the significance of comets that arises from the intersection of cosmic observation and Vedic philosophy.

And perhaps this is precisely one of the most interesting lessons we can draw from studying them.

Comets show us that the sky is not static. Even what seems very distant, ancient, and stable is part of a ceaseless process of transformation. Matter that has remained hidden for billions of years in the most remote regions of space can suddenly become luminous and visible when it encounters the Sun’s energy.

For the masters of Jyotiṣa, this phenomenon deserved to be interpreted as a sign within the cosmic order. For modern science, it represents an extraordinary opportunity to learn about the material history of the universe.

These are two different perspectives that should not be confused, but which can foster the same attitude: observing the sky with attention, curiosity, and respect.

After all, when we look up at a comet, we’re observing something that could be much older than Earth itself. And at the same time, it’s bringing us a message from the stars.