Kethu is the Lord of Descending/South lunar node. Kethu is generally referred to as a “shadow” planet. He is considered as Tail of the Demon Snake. It is believed to have a tremendous impact on human lives and also the whole creation. In some special circumstances it helps someone achieve the zenith of fame. He is Tamas in nature and represents supernatural influences.
Astronomically, Kethu and Rahu denote the points of intersection of the paths of the Sun and the Moon as they move on the celestial sphere. Therefore, Rahu and Kethu are respectively called the north and the south lunar nodes. The fact that eclipses occur when Sun and Moon are at one of these points gives rise to the story of the swallowing of the Sun and the Moon.
The Naganatha Swamy Temple or Kethu Sthalam is a Hindu temple in the village of Keezhaperumpallam, 2 kilometres from Poompuhar. The presiding deity is Kethu, a shadow planet. However, the main idol in the temple is that of “Naganatha Swamy” or Shiva.
The temple has a 2-tier rajagopuram surrounded by two prakaram(closed precincts of a temple).
Navagraha Keezhaperumpallam is one of the nine Navagraha sthalas located in the Cauvery Delta region dedicated to shadow planet Kethu. The Naganathar temple known as the KethuNavagrahastalam is located in the hamlet ofKeezhperumpallam in the vicinity of Tiruvenkaadu nearMayiladuturai /Chidambaram in Tamilnadu.This is an ancient Saivite shrine where legend has it thatKethu, one of the 9 celestial bodies central to astrological beliefs worshipped Shiva.
Rahu and Kethu are associated with the legend of the churning of the milky ocean. There is a shrine dedicated to Kethu in this temple where worship services are offered.