When the Planets Rahu and Ketu surrounds all other planets and rest 7 houses being empty is said Kala Sarpa Dosha or yoga. Unusual and unexpected incidents happens in the person’s life like child problems, loss in business, family problems etc.
This Pariharam is performed by invoking Rahu and Ketu and chanting mantras to please the Graha and the homam is performed as per the shastras to get rid of all the problem occurring due to this dosha.