Vivaha porutha attavanai is an astrology book that helps the astrologer to calculate the thirumana porutham ( marriage matching ) for the people. In general , astrologers predicts the future by the position of stars and planets. Likewise , they calculate the thirumana porutham by the rasi and stars of the couple which is called nakshatra porutham. This book acts as the best marriage matching calculator for the astrologers.