The Naganathaswamy Temple at Thirunageswaram is one of the nine sacred Navagraha temples of Tamil Nadu, dedicated to Rahu. Located about 6 km from Kumbakonam on the Kumbakonam–Karaikal road, this ancient shrine is also known as Rahu Sthalam and Naganathaswamy Temple . The presiding deity is Lord Shiva worshipped as Naganathaswamy, with his consort Parvati depicted as Girigujambigai .
The temple is revered in the 7th-century Tamil Saiva canonical work, the Tevaram, and is classified as a Paadal Petra Sthalam . The present structure was built during the Chola period, with later additions by the Vijayanagar and Nayak rulers. The temple features a five-tiered rajagopuram and a large tank called Surya Theertham, which is believed to have been created by Surya himself .
The Legend of Rahu: According to Hindu mythology, Rahu is an asura who disguised himself as a deva to drink the nectar of immortality (amrit) during the churning of the cosmic ocean. When the Sun and Moon discovered his deception and informed Vishnu, the god severed Rahu's head with his discus. However, since Rahu had already consumed the nectar, he became immortal. His head became Rahu and his body became Ketu. Rahu is believed to have worshipped Lord Shiva at this sacred site to be relieved of the sin of deception and to gain divine status. Pleased with his devotion, Shiva blessed him and granted him a place among the Navagrahas .
The Milk Miracle: This temple is famous for a unique phenomenon that occurs during the Rahu Kalam (an inauspicious period each day). When milk is poured over the idol of Rahu as an offering, the milk appears to turn blue and changes color as it flows down, resembling blood. Scientists have investigated this phenomenon but have been unable to provide a conclusive explanation. Devotees consider this a divine miracle and throng the temple during Rahu Kalam to witness it. This is considered one of the most important Rahu Parihara Sthalams in Tamil Nadu .
Unique Features: The temple has a separate shrine for Rahu with his consorts Nagini and Naga Kanni, facing the direction of the Sun (Surya). This is significant because Rahu and Surya are considered enemies in Vedic astrology, yet here Rahu faces Surya as a mark of respect and submission. The temple also houses a rare idol of Nataraja with eight arms in the Urdhva Thandavam posture . The sacred tank, Surya Theertham, is believed to have been created by Surya to worship Lord Shiva. The temple's Sthala Vriksham is the Vanni tree .
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