According to our mythological data, this subject was invented and revealed by Lord Shiva to Mata Parvati, narrated by Lord Brahma, compiled by Sage Bhrigu (the Manas Putra of Lord Brahma), and spread to the world by Sage Narada (one of the greatest devotees of Lord Vishnu). Step by step, this process has been passed down from one sage to another as their disciple. The first tradition started by Sage Bhrigu in the Satya Yuga (compiler of Bhrigu Samhita, the first-ever work on Jyotish Shastra). Bhrigu compiled about 500,000 horoscopes and recorded the life details and events of various persons. His compiled version…has formed a giant database for further research & studies for all. All Nadis & other branches of Indian Astrology have been derived from this. 27 Nakshatras and its various uses, 9 Planets and their all possible permutation & combination, all Vargas (which Bhrugu got from Lord Brahma) and its various uses, all types of Dashas and their uses, 12 Rashis and their values etc. everything was compiled & described by him through his classic, it is said that he has done this mammoth work with the help of Lord Ganesha and his formulation could have been erected up to 45 million horoscopes at that time. Sage Bhrigu taught this art to his son Shukra and his other pupils. Bhrugu Nadi is a predictive part of his classic. This is the starting history of Nadi Jyotish. It is said that after sage Bhrigu, 7 sages (Atri, Agastya, Vasistha, Narad, Songinar, Vishwamitra & Jaimini) have compiled their work on nadi, broadly known as Saptarushi Nadi. Else 18 siddhars (siddha purushas) of Tamil Nadu have also proceeded to intact this very matter. Their nadis are named as;
Types of Nadi in Old Tamil (Vatthhezzetthu) by 18 sidhars;