How to interpret the result
In a constructed chart with arcs from Rahu of 14, 38, 52, 96, 120, 151 and 177 degrees, all seven planets are on the Rahu-to-Ketu side and the result reads formation under this rule. If the planet at 177 degrees were the Moon and the birth came about six hours later, it would pass 180 degrees and the result would read no complete formation, so one fast planet near the axis can decide the outcome.
Why it matters
Kaal Sarp is a popular pattern check, and many writers note that it does not appear in the best-known classical texts such as Parashara's. Regional versions disagree about partial enclosures and direction, so this page applies one strict rule you can check by hand.
Traditional meaning
The name is usually translated as serpent of time, with Rahu pictured as the serpent's head and Ketu as its tail. Some traditions give the reverse arrangement, planets running from Ketu to Rahu, its own name and reading, and none of these readings measures how a life goes.
Reflection use
If the result reads formation, find the planet closest to either node and read its house and sign as usual. Treat the pattern as one structural observation and let the rest of the chart and your circumstances carry the weight.