Devas and Asuras stirred the ocean of milk with Mount Mantara as the stick and snake Vasuki as the rope. The snake, unable to bear the pain emitted poison. Devas and the demons feared the ill effects of poison and prayed Lord Shiva. The Lord Shiva swallowed the poison but Goddess Parvathi rushed to prevent Him from swallowing .This leads poison to stop in His neck. Due to this, the Lord Shiva is called Neela Kanda and His throat turned blue with the poision. Vasuki, the King of serpents did penance and worshipped Lord Shiva for years. The Lord appeared before the snake. He blessed the snake to be enshrined in a temple in the bamboo forest and relieve the devotees from the ill effects.
The nine navagraha deities are generally found in small, square enclosure in every temple (Nine Navagraha temples). Natives afflicted by Ketu are stricken with fears of dacoity, loss of property, poisonous bites and putra dosha. One can get rid of the afflictions, by praying Lord Ketu. Ketu is a half-planet that bestows wisdom. Ketu’s effects are similar to Mars. Ketu is neither feminine nor masculine. Ketu credits with wind-dominated, animalistic and compulsive in behaviour.