Time & Cosmology

Many religions picture time as a line: one creation, one history, one end. The Hindu traditions picture it as a wheel. Worlds arise, flourish, decline and dissolve, and then arise again — cycle within cycle, without beginning and without end. The wheel of rebirth that carries each soul turns inside a far greater wheel that carries the universe itself.

In the beginning — perhaps

The oldest reflection on creation is also one of the most honest. The Rig Veda’s Nāsadīya Sūkta, the “hymn of non-being,” begins before existence and non-existence, and ends not with an answer but with a question:

Three thousand years ago, a Vedic poet ended a hymn about the origin of everything with “perhaps he does not know.” That humility runs through the tradition: the later cosmologies are grand and detailed, but they never quite forget that the deepest origins lie beyond knowing.

The four ages

The best-known cycle is that of the four yugas, or ages. Each is shorter than the last, in the ratio 4 : 3 : 2 : 1 — and in each, dharma grows weaker. The Purāṇas picture dharma as a bull: it stands on four legs in the first age, and loses one in each age after.

• Satya (Kṛta) Yuga सत्य1,728,000 yrs
  🐂 Dharma on four legs — the age of truth; people live long and virtue is natural.
• Tretā Yuga त्रेता1,296,000 yrs
  Three legs — sacrifice and ritual flourish; the age of Rama.
• Dvāpara Yuga द्वापर864,000 yrs
  Two legs — worship and doubt mixed; the age of Krishna and the Mahābhārata.
• Kali Yuga कलि432,000 yrs
  One leg — the age of strife; ours.

Together the four make a mahāyuga (“great age”) of 4,320,000 years. These are the figures of the Purāṇas and the astronomical Sūrya Siddhānta; not every authority agreed — the great astronomer Āryabhaṭa (5th century) divided the great age into four equal quarters instead.

Our age: Kali

By traditional reckoning, the Kali Yuga began in 3102 BCE, around the time of Krishna’s departure from the world — making this year, by the same count, about Kali year 5,127. The texts describe it bleakly: lifespans shorten, rulers grow greedy, wealth replaces virtue, and dharma limps on a single leg.

Historians note that the four-yuga scheme with these huge numbers appears only in the epics and Manu, around the turn of the era, and that the 3102 BCE start was calculated by astronomers such as Āryabhaṭa in the 5th–6th centuries CE.

But Kali has a surprising consolation. Because the age is so hard, the way to the divine becomes easier:

This verse is one of the roots of the great devotional movements: in a dark age, the simplest practice — chanting the divine name — is enough. At the very end of Kali, the Purāṇas say, Vishnu will appear as Kalki, the tenth avatar, to end the age of strife — and a new Satya Yuga will dawn.

Zooming out

The yugas are only the smallest wheel. Tap outward through the larger cycles:

Your address in time

These numbers are not only for books. Before a formal puja, the priest recites a saṅkalpa, a statement of intention — and it begins by locating the worshipper in cosmic time and space, from the largest cycle down to today:

1. Dvitīya parārdha द्वितीयपरार्धेIn the second half of Brahmā’s life — his 51st year.
2. Śveta-varāha kalpa श्वेतवराहकल्पेIn the kalpa of the White Boar — the first day of that year, about 1.97 billion years along by traditional reckoning.
3. Vaivasvata manvantara वैवस्वतमन्वन्तरेIn the age of the seventh Manu.
4. Aṣṭāviṃśatitame kaliyuge अष्टाविंशतितमे कलियुगेIn the Kali Yuga of the 28th mahāyuga, in its first quarter.
5. Jambūdvīpe Bhāratavarṣe जम्बूद्वीपे भारतवर्षेOn the continent of Jambūdvīpa, in the land of Bhārata — and then the year, month, lunar day, and the place where the worshipper stands.

Every puja thus begins by setting one small human act inside the whole vastness of time — not to make it feel insignificant, but to place it within the sacred order.

Dissolution, and the dance

What ends must also be explained. The Viṣṇu Purāṇa names four kinds of pralaya, “dissolution”:

• Nitya, constant — the dissolution happening every moment, as beings are born and die.
• Naimittika, occasional — at the end of each day of Brahmā, when the worlds are drawn in.
• Prākṛta, elemental — at the end of Brahmā’s life, when all of nature dissolves into its source.
• Ātyantika, absolute — liberation: the dissolution of the cycle itself for one who is freed.

The last is the most striking: the tradition places mokṣa on the same scale as cosmic dissolution. For the liberated soul, the whole wheel of time comes to rest.

Modern readings

Modern reading The astronomer Carl Sagan, in his 1980 series Cosmos, remarked that Hinduism is the only great faith whose time-scales match those of modern cosmology. A kalpa of 4.32 billion years is strikingly close to the age of the Earth (about 4.5 billion), and Brahmā’s full day and night (8.64 billion) is of the same order as the age of the universe (about 13.8 billion).

Modern reading Others have proposed much shorter cycles. Sri Yukteswar, in The Holy Science (1894), argued for a yuga cycle of 24,000 years, and calculated that the Kali Yuga had already ended around 1700 CE — a view popularised by his student Paramahansa Yogananda.

Scholars urge caution with both: the Purāṇic figures grew from ritual, astronomical and symbolic reckoning, not from geology or physics. The resemblance to modern numbers is remarkable, but it is a resemblance of imagination and scale rather than a prediction.

Test your sense of time:

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Sources & further reading

• Ṛgveda 10.129 — Jamison & Brereton, The Rigveda (Oxford, 2014).
• Viṣṇu Purāṇa 1.3, 6.1–5 — trans. H. H. Wilson (1840; many reprints).
• Bhagavad Gītā 8.17–19; Manusmṛti 1.64–86 (the yugas and the bull of dharma).
• Luis González-Reimann, The Mahābhārata and the Yugas (Peter Lang, 2002) — on how the yuga scheme developed.
• Swami Sri Yukteswar Giri, The Holy Science (1894) — the 24,000-year cycle.
• Carl Sagan, Cosmos (1980), episode 10, “The Edge of Forever.”