Series 7 — Tamil Festival Astronomy

The Sky Science Behind
Tamil Nadu's Great Festivals

Every major Tamil festival is timed to a precise astronomical event — a star cluster at its peak, the Sun crossing a zodiac boundary, or the Moon in a specific Nakshatra. These are not coincidences. They are 2,000 years of Tamil sky-watching, encoded in celebration.

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கார்த்திகை

தீபம்

Festival 1 · November–December

Karthigai Deepam

The ancient Tamil festival of lamps — celebrated when the full moon falls in the Pleiades (Karthigai Nakshatra). Every Tamil home fills with oil lamps. A great beacon blazes atop the sacred hill of Arunachala at Thiruvannamalai.

Full Moon Pleiades at zenith 3 conditions required Thiruvannamalai beacon

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☉

தை

பொங்கல்

Festival 2 · January 14 every year

Thai Pongal

The greatest Tamil harvest festival — the day the Sun enters Capricorn (Makaram) and begins its northward journey (Uttarayana). Fresh rice is boiled in milk outdoors under the open sky as a direct act of solar worship, performed without interruption for over 2,000 years.

Sun enters Makaram Uttarayana begins 4-day festival January 14 always

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மார்கழி

திருப்பாவை

Festival 3 · December 16 – January 13

Margazhi

The holiest Tamil month — 30 days of pre-dawn ritual, daily Thiruppavai hymns, and the richest winter sky of the year. Orion blazes overhead, the Pleiades reach their zenith at midnight, and Sirius rises. Lord Krishna called it his own in the Bhagavad Gita.

Orion overhead 30 Thiruppavai verses Pre-dawn rituals Sagittarius month

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