This is regarded as a Guru Sthalam where the dhakshinamurthy great reverence. Alangudi is the place where Lord Shiva consumed the deadly poison as emitted during the churning of the 'paarkadal' (Sea of milk). Hence the place is known as Alangudi, which literally mean 'the place where Lord Shiva consumed the deadly posion'. The Devas, when churning the paarkadal for nectar, were hindered by the poisonous fumes from the snake Vasuki and prayed to Lord Siva for deliverance. Lord Siva consumed the deadly poison (Ala Visham), thus giving rise to the name Alangudi to this Sthalam and the Lord was known as "Aabathsagayeshwarar" (One who defends from the danger).
The another legend that Lord siva as a ferryman(boatman) helped Sundaramurthy Swamigal cross the river (Vettaru) which was in spate, to reach this Sthalam. As the boat was overturned by hitting a rock on halfway, Lord Shiva on his rishaba vagana saved him from the illusion and helped him to reach the sthala. It is believed that Sundarar received his Gnanaupadesam after his darshanam of Dakshinamurthy at this sthala. The specialty in this temple is lord Guru is engraved on the wall and is not in the form of separate idol reunited with shiva.
Benefits of Worshipping:The person who come to visit Alangudi Guru Sthalam(Jupiter planet) they will find relief from financial problems, getting delay in child, marriage problems will be solved and also the person will get political power, and spiritual power even though those who are committed sins in previous birth there is a remedy in this temple.
Things of Worshipping:Day : Thursday
Donation : White Channa Dhal, Yellow Cloth, Yellow Sapphire, Turmeric, Yellow Flowers, Gold, Feeding Brahmins, Yellow Plantain Fruits
Homa/Havan : Wood From Pipple Tree (Ficus religiosa)
Medicinal Bath : Honey, White / Yellow Mustard Seeds, Jasmine, Chameli
Flower : White Jasmin
Cloth : Yellow cloth
Prasatham (Food) : Soaked Channa dhal