One is said to have "Kalasarpa dosham" if all the planets are positioned in between Rahu and Kethu in ones horoscope. Srivanchiyam is a lesser-known parihara sthalam for Kethu and Kalasarpa dosham. Pariharam for Rahu is also done here. Rahu-Kethu is here in a single form and known as "Chanda Rahu".