Chapter 6: Cosmology: The Three Worlds, the Fourteen Lokas, and the Four Yugas

1. The Triloka: three worlds

The oldest Vedic cosmology, found already in the Gayatri Mantra of the Rigveda (RV 3.62.10), divides the universe into three worlds (triloka): Bhurloka (the earth), Bhuvarloka (the intermediate or atmospheric realm), and Svarloka (the heavens) (Klostermaier, 2007, ch. 6, on Sanatan Dharma cosmology). This threefold scheme is the oldest and most widely used framework and still appears in everyday ritual formulas.

2. The fourteen lokas

Later Puranic cosmology elaborates this into a fourteen-tier universe: seven upper worlds (Bhu, Bhuvah, Svah, Mahah, Janah, Tapah, and Satya-loka, the last being the abode of the creator god Brahma) and seven lower or nether worlds (collectively called Patala, including Atala, Vitala, Sutala, Talatala, Mahatala, Rasatala, and Patala proper), often described as the sumptuous, jewel-filled realms of Nagas (serpent-beings) and certain Asuras rather than as places of punishment in the Christian sense of “hell” — the Puranas describe separate, additional hell-realms called Naraka for the punishment of sinners, distinct from Patala (Klostermaier, 2007, pp. 130–134; the Vishnu Purana and Bhagavata Purana are the primary textual sources for this schema).

3. The four yugas and the wheel of time

Sanatan Dharma cosmological time is cyclical rather than linear, organized into four great ages (yugas) of progressively declining virtue and lifespan, together forming one Mahayuga: Satya Yuga (also Krita Yuga), the age of truth, lasting 1,728,000 years, in which dharma stands on all four legs; Treta Yuga, 1,296,000 years, dharma on three legs; Dvapara Yuga, 864,000 years, dharma on two legs; and Kali Yuga, 432,000 years, dharma on a single leg — the current age, traditionally held by Puranic reckoning to have begun around 3102 BCE, conventionally linked to the date of the Mahabharata war and Krishna’s departure from the earth (Klostermaier, 2007, pp. 137–141, discusses both the numerical scheme and its non-literal, symbolic use by many modern Sanatan Dharma commentators, who read the yugas as describing recurring moral cycles rather than requiring belief in the specific literal year-counts).

One thousand Mahayugas make one kalpa, a single “day” of Brahma the creator, at the end of which the universe dissolves (pralaya) before a new cycle of creation begins — and 100 of Brahma’s 360-day “years” constitute a single lifetime of Brahma himself, after which even Brahma dissolves back into Brahman, only for the entire process to begin again. This vast, breathing, cyclical cosmos, without any single absolute beginning or end, stands in sharp structural contrast to the linear creation-to-apocalypse cosmologies of the Abrahamic traditions, and is one of Sanatan Dharma’s most distinctive philosophical contributions to world thought.

5. Cosmology is plural rather than uniform

Sanatan Dharma cosmological literature does not preserve one immutable diagram of the universe. Different Vedic, epic, Purāṇic and philosophical sources use different models and symbolic vocabularies. The three-world model is ancient and widely attested, but later Purāṇic traditions develop increasingly elaborate vertical and cyclical cosmologies. The fourteen-loka scheme is therefore best presented as one important later cosmological framework rather than as a complete description of what every Sanatan Dharma text means by “the universe.”

The same caution applies to the yuga system. Satya, Tretā, Dvāpara and Kali are arranged as successive ages within a larger cyclical conception of time, but texts differ in details of their chronology, characteristics and relationship to larger cosmic cycles. Presenting the traditional numbers as if they were archaeological measurements would confuse theological cosmology with empirical chronology. They are better understood as part of a religious philosophy of recurring creation, decline and renewal.

6. Cosmic time and historical time

One of the most important interpretive distinctions is between mythic or cosmological time and historical chronology. A Purāṇic account may use immense cycles to express the scale of cosmic processes without intending to provide a modern chronological dating system. Conversely, historians may date manuscripts, inscriptions, temples and archaeological sites using independent evidence. These two systems can coexist within a religious culture without being treated as identical forms of knowledge.

This distinction also prevents a common error in popular writing: converting symbolic or theological descriptions into claims of modern scientific prediction without textual and historical evidence. A rigorous portal should explain the cosmological meaning of a tradition while clearly identifying where empirical verification is possible and where it is not.

4. Historical context, evidence, and interpretation

The subject of Cosmology: The Three Worlds, the Fourteen Lokas, and the Four Yugas needs to be approached at more than one level. A religious tradition is not only a collection of doctrines; it is also a record of texts, institutions, practices, places, memories, and changing interpretations. The same word may carry different meanings in different centuries, and the same institution may change while retaining its name. For that reason, the discussion in this chapter distinguishes, wherever the evidence permits, between what a primary source says, what a later community remembers, and what historians infer from comparing independent evidence. This distinction is especially important when a tradition describes its own origins in sacred or idealized language.

Chronology is another safeguard. Dates in South Asian religious history are often approximate because manuscripts are later than the compositions they preserve, oral traditions can predate their surviving written forms, and legendary biographies may combine historical memory with theological purpose. A date attached to a text should therefore not automatically be treated as the date when every idea in that text first existed. Conversely, uncertainty about an exact date does not make a source useless. Linguistic change, intertextual references, material culture, inscriptions, manuscript relationships, and the geographical distribution of traditions can all help establish relative sequence. The result is a history that sometimes has to use ranges and probabilities rather than false precision.

Regional diversity is equally significant. Sanatan Dharma traditions developed across languages and political regions, and religious vocabulary moved between Sanskrit, Prakrits, Tamil, Kannada, Telugu, Bengali, Marathi, Hindi, Gujarati, and many other languages. A practice described in a Sanskrit normative text may not have been followed in the same form by every community. Conversely, a practice absent from a particular Sanskrit text may be important in a local tradition. Historians therefore compare textual sources with inscriptions, temple records, poetry, ritual manuals, oral histories, archaeology, and ethnography when those sources are available. This approach avoids treating elite textual traditions as a complete record of ordinary religious life.

The chapter's topic also demonstrates why the categories used in modern scholarship should be handled carefully. Terms such as “Sanatan Dharma,” “sect,” “orthodox,” “reform,” “tradition,” “modern,” and “folk” are analytical tools, not neutral labels that existed in exactly their present meanings throughout history. A community may understand itself through lineage, deity, village, language, caste, monastic order, philosophical school, or several of these at once. Modern institutions can preserve older practices while introducing new organizational forms, technologies, educational programs, or global networks. Describing such developments as either pure continuity or complete rupture usually misses the more interesting historical process of selective adaptation.

Primary sources deserve particular attention because they constrain what can responsibly be said. Where the chapter discusses a scripture, the strongest evidence is the text itself in a reliable critical or scholarly translation. Where it discusses an institution, inscriptions, legal records, institutional constitutions, archival documents, court records, or contemporary statements can be more probative than later summaries. Secondary scholarship remains indispensable for chronology, context, translation, and historiographical disagreement, but it should be possible for a reader to trace important claims back toward the underlying evidence. Where evidence is disputed, the text should identify the disagreement rather than manufacture certainty.

Finally, interpretation should remain proportionate to evidence. Similar symbols do not necessarily prove direct historical borrowing; theological similarity does not by itself establish institutional descent; and a later community's claim about antiquity is evidence for that community's self-understanding, not automatically proof of the claimed chronology. These cautions do not diminish the significance of religious traditions. They make the history stronger by allowing sacred claims, scholarly hypotheses, archaeological evidence, and modern institutional narratives to be distinguished rather than conflated. The aim of this chapter, as with the book as a whole, is therefore not to settle every contested question but to give readers enough evidence and context to understand why the questions remain meaningful.

Cosmology as a history of changing models

South Asian cosmological traditions contain multiple models rather than one universally fixed map. Vedic hymns contain speculative accounts of creation, cosmic ordering and the relationship between gods, humans and sacrifice. Later Upanishadic texts shift attention toward Brahman, Atman and knowledge. Epic and Purāṇic traditions elaborate increasingly detailed accounts of worlds, divine realms, subterranean regions, cosmic mountains, cycles of creation and dissolution, and enormous measures of time. These systems should be studied as historical layers rather than merged into a single diagram. [Flood 2020]

The popular “fourteen lokas” scheme is especially useful as an example. It is associated with later cosmological classifications in which multiple realms are arranged above and below the human world. Different texts do not always present exactly the same terminology or organization, so a portal should identify the textual source for any particular list. Likewise, the four yugas belong to a cyclical conception of time that became prominent in epic and Purāṇic cosmology. The familiar numerical durations are theological-cosmological measures, not empirical chronologies established by archaeology.

This distinction matters because ancient cosmology can be valuable without being treated as modern physical science. Cosmological texts encode ideas about moral order, ritual time, kingship, human mortality, liberation and the scale of existence. Their historical significance lies partly in what they tell us about how communities imagined the relationship between human life and cosmic processes. Modern readers can compare these models with scientific cosmology, but comparison should not be converted into claims that ancient authors possessed modern astrophysical knowledge unless independent evidence supports the claim.

The strongest approach is therefore comparative and historical: identify the text, date or relative layer where possible, describe its cosmological vocabulary, and then ask how later traditions reused it. This preserves both the intellectual sophistication of Sanatan Dharma cosmology and the distinction between religious cosmography and modern physical measurement.

Time, rebirth, and moral cosmology

Cyclical time in Sanatan Dharma traditions is closely related to ideas about rebirth and moral causation. The cycle of samsara places individual existence within repeated birth and death, while moksha represents release from that cycle. Epic and Purāṇic cosmologies extend the same cyclical logic to worlds and cosmic ages. Creation and dissolution can occur repeatedly on immense scales.

These models are not simply attempts to calculate physical time. They also express moral and existential ideas. A declining yuga can symbolize a world in which dharma becomes increasingly difficult to sustain; a cosmic dissolution can relativize human political power; and immense cycles can place a human lifetime within a much larger metaphysical horizon.

The historical development of these ideas is important. Early Vedic literature, early Upanishads, epics and Puranas do not all present the same cosmological system. Later texts often integrate older concepts into increasingly elaborate cycles. A reader should therefore ask when a particular cosmological scheme becomes prominent and which textual community is presenting it.

Reading cosmology as theology

The cosmological systems of Sanatan Dharma texts also organize ethical imagination. The location of a being within a cosmic hierarchy can be related to karma, ritual merit and the possibility of liberation. Higher heavenly realms are not necessarily equivalent to moksha; a being can attain a pleasurable or elevated rebirth and still remain within samsara. This distinction is important because it prevents the common mistake of treating “heaven” and “liberation” as interchangeable concepts. The cosmological map is thus part of a larger soteriological argument about impermanence and release.