Ask most people when the world began and they will reach for a single date, far back, and a single end, far ahead: a line with two ends. Hindu tradition does not see time this way. It sees a wheel. Worlds are made, run their course, dissolve and are made again, and the one who watches it all, the Supreme, is not at the start of the line but at the hub of the wheel, present at every turn.
This is not a minor detail of mythology. It shapes how Hindus think about history, about progress and decline, and about what kind of spiritual practice makes sense right now. Here is the traditional picture, told plainly.
The four ages
The smallest full cycle of time is the mahayuga, "great age", which is divided into four yugas, each shorter and more troubled than the last. Their traditional lengths, given in the Puranas and the Manusmriti, are counted in human years and include a "dawn" and a "dusk" on either side of each age:
- Satya Yuga (also called Krita Yuga): 1,728,000 years. The age of truth. Dharma stands on all four legs; people are long-lived and naturally inclined to the divine.
- Treta Yuga: 1,296,000 years. Dharma loses a leg. Sacrifice and ritual come to the fore. The Ramayana is set here.
- Dvapara Yuga: 864,000 years. Dharma stands on two legs. Scripture is divided and knowledge grows harder to hold. The Mahabharata and the life of Krishna close this age.
- Kali Yuga: 432,000 years. Dharma limps on one leg. Quarrel, deceit and shortness of life mark the age. By tradition it began with Krishna's departure from the earth, and we are living in its early centuries.
The proportion is 4:3:2:1, so the whole mahayuga is 4,320,000 years. The image of dharma as a bull losing a leg in each age comes from the Bhagavata Purana, where King Parikshit finds the bull standing on a single leg at the dawn of Kali Yuga and asks who has wounded him.
Some modern teachers, Sri Yukteswar among them, proposed much shorter yugas and a different placement of the present age. The figures above are the ones the classical texts give.
A day of Brahma
A thousand mahayugas make one kalpa, a single day of Brahma the creator: 4,320,000,000 years. His night is of equal length. The Bhagavad Gita states it in one verse:
Those who know that a day of Brahma lasts a thousand ages, and his night a thousand ages, they truly know day and night.
At the dawn of Brahma's day the worlds are made; at its dusk they dissolve, and through the night all that was lies latent. Brahma lives a hundred such years, and at the end of his life the whole of creation, Brahma included, returns to the Supreme, until a new Brahma is born from the navel of Vishnu and the wheel starts again. The present kalpa is traditionally named the Shveta Varaha Kalpa, after the white boar form Vishnu took to lift the earth from the waters at its beginning.
Within each day of Brahma there are fourteen manvantaras, "ages of Manu", each presided over by a Manu, the progenitor of humanity for that span, with his own Indra and his own seven sages. A manvantara lasts about seventy-one mahayugas. We are in the seventh, that of Vaivasvata Manu, who survived the great flood with the help of Vishnu's fish avatar, Matsya. Anyone who has heard a priest recite the sankalpa at the start of a puja has heard this whole address spoken aloud: this kalpa, this manvantara, this mahayuga, this yuga, this year, this month, this day. It places a small act within the largest possible frame.
Many worlds
Hindu cosmology is as generous with space as with time. The Puranas describe fourteen lokas, worlds or planes. Seven rise upwards: Bhu, the earth; Bhuvar, the atmosphere; Svar, the heaven of Indra and the gods; and above these Mahar, Jana, Tapa and Satya, the worlds of the sages and of Brahma himself. The first three are the bhur bhuvah svah of the Gayatri mantra. Seven descend below: Atala, Vitala, Sutala, Talatala, Mahatala, Rasatala and Patala, the realms of the nagas and asuras, which the Puranas describe not as hells but as splendid places lit by jewels. Beyond all of these lies Vaikuntha, the abode of Vishnu, or Kailasa, that of Shiva, or Goloka, that of Krishna, depending on the tradition: a realm not made and not unmade with the kalpas.
Nor is ours the only universe. The Bhagavata Purana speaks of countless universes emerging from the pores of Vishnu's cosmic form as he breathes. Ours is one bubble among them.
Kalki at the end of the age
Every age ends, and the end of Kali Yuga has a name. The Bhagavad Gita gives the general principle:
Whenever there is a decline of dharma and a rise of adharma, O Bharata, then I send forth myself.
The Puranas describe the tenth and final avatar of Vishnu for this cycle: Kalki, who will be born in a village called Shambhala, ride a white horse and carry a flaming sword. He will bring the age of quarrel to its close and restore dharma. With that, Satya Yuga returns and the wheel turns onwards. Kalki is not a figure of dread in Hindu thought. He is the guarantee that decline is not final, that the story of the world is not a slide into darkness but a cycle with a morning on the far side.
Living in Kali Yuga
It can be dispiriting to be told that one is living in the worst of the four ages. But the tradition turns this on its head. The Bhagavata Purana, having listed at length the faults of Kali Yuga, says:
O King, Kali Yuga is an ocean of faults, yet it has one great virtue: simply by chanting the name of Krishna one is freed from bondage and reaches the Supreme.
It goes on to say that what was attained in Satya Yuga by meditation, in Treta by sacrifice and in Dvapara by temple worship, is attained in Kali by kirtan, the singing of the name of Hari. The demanding disciplines of earlier ages assumed long life and uncluttered minds. Kali Yuga offers a shorter path to match its shorter attention: the name.
The Kali Santarana Upanishad, a short text framed as a conversation between the sage Narada and Brahma, makes this explicit. Narada asks how one may cross over the age of Kali, and Brahma answers that the sixteen names, Hare Rama Hare Rama Rama Rama Hare Hare, Hare Krishna Hare Krishna Krishna Krishna Hare Hare, destroy the evils of the age, and that no better means exists. This is the mahamantra that Chaitanya spread through Bengal in the sixteenth century and that is sung in kirtans across the world today.
Other traditions give the same answer in their own terms: the name of Rama for Tulsidas, Namah Shivaya for Shaivas, the mantras of the Goddess for Shaktas. In a difficult age, practice should be simple, frequent and heartfelt rather than elaborate.
To reflect on
- The scale of the yugas is meant to shrink the ego a little. Your difficulties are real, but they are also one turn of a very large wheel.
- Listen to the sankalpa at your next puja. It places you in the cosmos before asking anything of you.
- Decline is not the final word; the return of Satya Yuga is the tradition's way of saying that goodness recurs.
- Keep a name close. Choose one, say it daily, and let it do its work.