Kaal Sarp dosha check
Find out whether every planet in your chart falls on one side of the Rahu–Ketu axis.
The rule
Kaal Sarp (Kaal Sarpa) dosha is said to form when the Sun, Moon, Mars, Mercury, Jupiter, Venus and Saturn all lie on one side of the axis joining Rahu and Ketu. The check tests exactly that from your planets' longitudes. It then applies the cancellation used in practice: Jupiter or Venus in a kendra (the 1st, 4th, 7th or 10th house).
How much weight it carries
Kaal Sarp is a later concept; it is not described in the classical texts such as Brihat Parashara Hora Shastra, and astrologers differ on how much it matters. Read it alongside the rest of the chart rather than on its own.