The classical rule, applied literally
The check is this: if all seven grahas — Sun, Moon, Mercury, Venus, Mars, Jupiter and Saturn — fall inside the same half of the chart bounded by the Rahu-Ketu axis, that is a whole Kaal Sarp Dosha. Six on one side with a single planet outside is counted as partial. Anything else is not a dosha. Rahu is taken as the mean lunar node, Ketu exactly opposite, and the twelve named types are read from the sign Rahu occupies.
