Kaal Sarp Yoga is a very bad Yog in a person’s horoscope as per Hindu astrology. People who believe in astrology perform Kaal Sarp Puja to overcome the problems. It is highly benefitial to perform Kaal Sarp Puja in the vicinity Trimbakeshwar Temple as Shiva can remove all that is inauspicious and usher in peace and prosperity. After performing the puja one should take the blessing of Shiva at the shrine.
Please note that the Kaal Sarp Puja is not performed in the Trimbakeshwar Temple. It is performed by various pandits in their residence or at a place suggested by them. Or at a place that you suggest.
Kaal Sarp Yog happens when all navgrahas or planets or majority of navgrahas are located between Rahu and Ketu. When all the planets are located between moon's north node and the moon's south node Kal Sarp Yoga is formed. Complete Kal Sarp Yoga is formed only when half of the chart is unoccupied by planets.