There is one night a year when all of Tamil Nadu looks like a starry sky laid on the ground. Thousands of small clay lamps, the agal vilakku, are lit at doorways, on balconies, in courtyards and in temples. This is Karthigai Deepam, the Tamil festival of lights and one of the oldest celebrations in South India. It is devoted to Muruga (also called Karthikeya) and to Shiva in his form as infinite light. Its flames are said to drive away darkness and negative forces and to bring prosperity and joy to every home.
A festival over two thousand years old
Karthigai Deepam falls on the full-moon night of the Tamil month of Karthigai (November–December), when the moon passes through the Krittika constellation, the Pleiades. It is far older than many festivals of light we know: it already appears in the literature of the Sangam age, and the poet Avvaiyar, one of the best-loved voices of that era, writes about the lamps of this night. That a celebration has reached us with the same simple gesture, lighting a flame, says a lot about how deep the human need for light runs.
The legend of the column of fire
The best-known story tells how Brahma and Vishnu began arguing over which of them was greater. To end the quarrel, Shiva appeared as an immense column of fire and set them a challenge: find where it begins or where it ends.
- Vishnu became a boar and dug beneath the earth to find its base. He could not, and came back admitting it.
- Brahma became a swan and flew upwards to find its top. He failed too.
Shiva showed that the light of consciousness has no beginning and no end, and made peace between them. He then took the form of a hill at Tiruvannamalai: Arunachala, the red mountain. At its foot stands the great Arunachaleswarar temple, and it is there that the great fire is lit on this night. In Hindu iconography the scene is called Lingodbhava, the lingam as boundless light.
The legend of Muruga and the six stars
A second story links the festival to Muruga. He is said to have been born as six babies in a lake called Saravana Poigai, cared for by six maidens, the Krittika stars. On this night the goddess Parvati united the six children into one. That is why Muruga has six faces and is known in Tamil culture as Arumugan, “the six-faced one”, and why the festival’s name, Karthigai, comes from the Krittika.
How it is celebrated at home
The festival starts with a thorough cleaning of the house. Kolams, patterns of rice flour and flowers, are drawn in front of the door, and doorways are hung with garlands of mango leaves. Then the agal, clay lamps filled with oil or ghee, are lit. They come in many shapes:
- Lakshmi Vilakku, shaped like a woman with folded hands.
- Kuthu Vilakku, the tall metal lamp that recalls a five-petalled flower.
- Gajalakshmi Vilakku, shaped like an elephant.
Many families fast during the day and break the fast after sunset with special dishes. As the sun goes down, homes across Tamil Nadu light up at the same time: the triumph of light over darkness, and of unity over discord.
Tiruvannamalai: the Maha Deepam
The festival reaches its peak at the Arunachaleswarar temple in Tiruvannamalai, which holds a ten-day festival (the Brahmotsavam). Two things happen on the final day:
- Bharani Deepam: around 4 am, inside the temple, a flame is lit and five more are kindled from it, representing the five elements.
- Maha Deepam: around 6 pm, at sunset, that flame is carried to the summit of Arunachala and a huge cauldron of ghee is set alight. The fire can be seen for tens of kilometres and burns for days, kept alive by devotees’ offerings of ghee.
Many pilgrims also walk the Girivalam, the roughly 14 km circuit around the mountain, often barefoot and in silence. Arunachala is also the mountain of Ramana Maharshi, the sage who lived there for more than fifty years and regarded it as his teacher.
Practical information
- When: in 2026, the Maha Deepam is on the evening of 24 November; the Tiruvannamalai Brahmotsavam runs from 15 to 24 November. The date changes every year with the Tamil calendar, so check it before you travel.
- Getting there: the nearest airport is Chennai; from there it is about 4 hours by road to Tiruvannamalai. Puducherry is also fairly close.
- Entry: free.
- Tips: crowds are huge, so book accommodation well in advance. Climbing the hill is not allowed on Deepam day. Wear light clothing that covers you, and shoes that are easy to slip off at temples.
- At home: many Tamils outside India light a row of lamps at the window at sunset.
Light inside and out
Karthigai Deepam is a luminous thread weaving together history, faith and Tamil culture. Surrounded by small flames, you understand that light dispels darkness not only in homes but in hearts too. It is an invitation to join an ancient tradition that keeps lighting the way to unity and harmony.
A practice on the mat
That night you could try trataka: sit comfortably in front of a candle, an arm’s length away, and gaze softly at the flame for a few minutes. Then close your eyes and watch the inner image. It is the same idea as the legend: the light we look for outside is already within.
Source: Incredible India – Karthigai Deepam.
