Kaal Sarp is the yoga formed when every graha sits between Rahu and Ketu. It is read as a lineage pattern rather than a personal fault — the same difficulty appearing in a family across generations, progress that reaches a point and stops.
The Skanda Purana names the shanti for it, and the Special Pujas below are performed on a tithi you choose at Karkoteshwar Mahadev in Ujjain, where the Karkotak Naag is worshipped alongside the linga.
17 sevas at 14 Teerth Kshetras — you choose the tithi.
No. The shanti-vidhi is taken once for the dosha, though many families repeat it on Naag Panchami as an annual observance. If a specific dasha is intensifying the effect, the vidhi is often taken again at the start of that period.
The 17 sevas here are Special Pujas — you choose the tithi yourself at checkout, so they are available year-round and are not tied to a fixed festival date.