Astrologically when all the planets are sandwiched between rahu and ketu it is deemed to be kala sarpa formation if the planets are moving towards ketu it is savya kala sarpa yoga clockwise movement and if the planets are moving towards rahu it is apasavya kala sarpa dosha anticlockwise movement however both type of planetary dispositions indicate ominious results if the ascendant or moon is not in the axis and all planets are in between rahu and ketu it is also kala sarpa yoga in astrology rahu is known as snakes mouth and ketu as a snake’s tail rahu and ketu are malefic planets and when all planets fall within ketu and rahu then they loose their strength if all the planets fall within ketu and rahu then too they are harmful but the impact is less then that of when they fall within rahu and ketu and it is called amrit yoga the janam nakshatra of rahu is bharni for which the lord is kaal and the janm nakshatra of ketu is kritika for which the lord is sarpa therefore the name kaal sarpa yoga has been derived from janam nakshatra of both . In fact rahu and ketu are called shadowy planets lord Vishnu beheaded rahu with his sudarshan chakra since he had taken nectar at the time of samudra manthan /churning of the ocean but by consuming nector he had become amar / immortal the head of beheaded rahu is called rahu and the trunk is called ketu the influence of kala sarpa yoga gets enhanced whenever a native havind this yoga fall in it major or sub period in transit , transit of rahu and ketu transitting over janmakalik rahu-ketu and moon also makes this yoga active .
In case a planet is with rahu or ketu then it is stronger in degrees from rahu or ketu then it is known as partial kaal sarpa yoga in this kaal sarpa yoga bad effects reduce to a certain limit kaal sarpa yoga gives mental and physical worries , children problems , obstructions in luck , failure in business family problems etc kala sarp yoga has its bright shades it is said to make one industrious , hardworking , aware of one’s own ability despite mental restlessness it raises the natives to top positions in their respective fields provided other raja yogas are also present in their horoscopes rahu –ketu axis favours rise in mundane life while ketu-rahu axis indicates elevation in spiritual matters it is also found that kala sarp yoga antives get betrayed by trusted friends and even relatives suffering due to developments in life strengthens the mind and mellows one’s outlook this is blessing of kala sarpa yoga there are 12 types of kala sarpa dosha
1 ) anant kal sarp yog rahu in lagna ketu in seventh house this will be operative upto 27 years to the native major indications are problems in martial front
2 ) kulika kal sarpa yoga rahu in the second house ketu in the eighth effective upto 33 years of age severe financial and domestic problems
3 ) vasuki kal sarpa yog rahu in third ketu in ninth impact upto 36 years of age and results in problems with relatives
4 ) shank pal kal sarpa yog rahu in fourth house ketu in tenth gives problems in lands ,vehicles , house and causes danger to mother upto age of 42
5 ) padma kalsarpa yog rahu in fifth house ketu in eleventh gives financial problems from progeny upto age of 48 years
6 ) maha padma kal sarpa yog rahu in sixth house ketu in twelfth gives financial discomfort upto the age of 58 years
7 ) takshak kal sarpa yog rahu in seventh house ketu in first disagreement with spouse and disputes with business partners upto age of 27 years
8 ) karkotak kal sarp yog rahu in eighth ketu in second causes frequent accidents upto age of 33 years
9 ) shankhnaad kal sarpa yog rahu in ninth house ketu in third problems with elderly people upto age of 36 years
10 ) ghataka kalsarpa yog ( patak ) rahu in tenth house ketu in fourth results in problems at the career front upto 42 years
11 ) vishakt kal sarpa yog rahu in eleventh house ketu in fifth causes problems in business upto age of 48 years
12 ) sheshnag kal sarpa yog rahu in twelfth house ketu in sixth heavy and wasteful expenditure upto age of 58 years
If considered on the basis of signs there are 12 signs and 12 ascendants in the table of ascendants on this basis here are 144 kala sarp yoga.