Use Horoscope by date of birth to find the natchathiram of the boy and girl
Nakshatra Porutham has the least weightage, maybe 10%, in Thirumana Porutham. Dosha Samyam
& Jathakam analysis are ranked higher than Rasi Porutham.
Nakshatra Porutham for a happy marriage,
a study of many couples' Rasi Porutham and their thirumana, kalyana vaazhkai throws more light on this