Naganathar temple at Keezhaperumpallam which is 8 kms from Thiruvenkadu is the kethu sthalam. Keezhaperumpallam is also known as Vanagari.
Here Naganathar is the main deity and His consort is Soundarya Devi. This temple is dedicated to Kethu (South Lunar Node), one of the nine planets
or navagraha. Kethu Bhagavan has the head of a snake and the body of an asura. It is rare to see Kethu Bhagavan with his head. Kethu
here to get rid of his sins. Here he is seen worshiping Naganathar with folded hands.