[/E K Dhilip Kumar]Planets must be between Rahu and Ketu and not between Ketu and Rahu. How do we ensure this? If we find Rahu first as we move anti-clockwise from the Ascendant and all the planets are between Rahu and Ketu, then the Yoga exists. Care should be taken to ensure that no planet is outside the semicircle by even 1 degree. For example, if Rahu is in 15 degrees of Cancer and Moon is in 16 degrees of the same sign, there is no Kala–Sarpa. Rahu moves clockwise. It will go to Cancer 16 degrees soon, but right now, at the time of birth, Moon is outside the Rahu–Ketu bracket. Hence there is no Kala–Sarpa.
