the temple of this town is the only temple dedicated to lord shani in the whole world. whenever lord saturn passes from one zodiac sign to the other (sani peyarchi), millions of people comes to thirunallar for worshiping the lord. the nala theertham or nalan kulam is the temple tank of this temple, which is said to be washing away all misfortunes caused by karma. that is why lord shani is renowned as "the dispenser of karma".