Karthigai Deepam is the festival of lamps observed on the full moon day of the Tamil month of Karthikai (corresponding to the Telugu Karthika Masam) when the Moon is in the Krittika (Pleiades) nakshatra. It typically falls in late November or December. While Deepavali (Diwali) is a pan-Indian lamp festival, Karthigai Deepam is specifically sacred in Tamil Nadu and parts of Andhra Pradesh, where it is considered the older and in some traditions the more sacred of the two lamp festivals. The festival commemorates the manifestation of Shiva as an infinite column of light (Jyotirlinga) at Tiruvannamalai.
The Legend of Tiruvannamalai's Deepam
The most spectacular expression of Karthigai Deepam is at Tiruvannamalai in Tamil Nadu, where a massive fire (Maha Deepam) is lit atop the sacred Annamalai hill on the evening of the full moon. This beacon — visible for miles around — represents the infinite column of fire that Shiva manifested when Brahma and Vishnu contested to find his top and bottom. Neither could find the ends. Shiva manifested as a pillar of flame — the Annamalai (the unmoving mountain of fire) — and the hill at Tiruvannamalai is believed to be that very Jyotirlinga in earthly form. The Deepam lit atop the hill is the annual re-ignition of that cosmic flame.
Lamps, Homes, and the Night of Light
On Karthigai Deepam evening, Tamil and Telugu households light rows of oil lamps (diyas) all around the home — on every window, doorstep, terrace, and wall. The entire street is transformed into a river of light. Unlike Diwali where firecrackers are prominent, Karthigai Deepam is a quieter, more meditative festival of pure lamp-light. The Karthigai Deepam meal typically includes Pori (puffed rice), Appam, and sweet Pongal. Families gather for a lamp-lighting ceremony, and the lamps are left burning through the night. The visual effect of a traditional home with dozens of lamps burning in the moonlit night is one of the most beautiful sights of the Tamil-Telugu festival calendar.
Karthigai Deepam in Telugu Households
In Andhra Pradesh and Telangana, Karthigai Deepam is observed particularly by Shaiva families and by households in regions closer to Tamil culture (Nellore, Tirupati, Chittoor districts). The month of Karthika is already a major lamp-lighting month in Telugu tradition — lamps are lit at home and in temples every evening throughout the month. Karthiga Purnima (the full moon) is the culmination of this month-long lamp festival, and the Karthigai Deepam adds an additional dimension of Shiva devotion to the Karthika Purnima. The Shivaratri of lamps, it is called by some — where the outer world of fire mirrors the inner light of realisation.