Nadi Granthas or the great books of subtle knowledge, are recordings of the Sapta Rishi. Sapta means seven and Rishi means Sages. Brahma conceived the Seven Great Sages out of his mind to help in his creation of the world. They were Bhrigu, Angira, Atri, Vishvamitra, Kashyapa, Vashishta, and Agastya. They knew the key to creation and the destiny of each and every individual born and yet to be born. What is their purpose? Why they were born? What karma they bring into their life? These Granthas were not written as predictions but as records of life and information on secret knowledge. This knowledge was not restricted to astrology alone but to other subjects including Science, Ayurveda, Yoga, Spirituality, Alchemy, Occult and Jyotisha. Their thoughts and knowledge was passed down orally from one generation to another and then finally written down on palm leafs. They were originally in Sanskrit but they also got translated into Tamil, Telegu, Malayalam and other regional languages. A collection of palm leafs become one chapter within a Granthas. So a complete Grantha could be many thousands of palm leafs.
The Nadis are equivalent to books today. The only difference is that Nadis are only filled with profound knowledge and the keys to existence on all levels- practical, spiritual and subtle. The knowledge within these Nadis is pure and profound. The mind of the interpreter may not be able to grasp the great information that the Sages are trying to impart and therefore bring the reading down to a more material level.
Some are not complete due to the loss or destruction of the leaves. Each of rishis has a Grantha from which his knowledge is dispersed. These Granthas include Agastya nadi, Brighu nadi, Brahma nadi, Shiva nadi, Kaushika nadi ( Vishwamitra) etc. The nadi reader traditionally follows the writings on just one of the great rishis
The records were kept in many libraries in ancient India. For centuries few realized the importance of these records and the nadi manuscripts were left to rot. Under the patronage of the Chola Dynasty that ruled South India from 10th to 13th Century AD, the leafs were classified and kept in the library of Thanjavur, Tamil Nadu. Other kings around India also helped in the preservation of these Nadi granthas as well.
Many of these leafs were destroyed by the invading armies of the Mughals and the British. While the Mughals asked them to be burnt, British took numerous Nadi back to Britain but they sold most connected to astrology. Valluvar community from Vaitheeswaran Koil in Tamil Nadu chiefly bought there. This is why most of the Nadis today are connected to astrology.
Each Nadi in Tamil Nadu is made up of ola or palm leaf, written in Vatta ezhuthu, a Tamil script, with a sharp, pen like instrument called ezhuthani. Rubbing peacock oil on auspicious occasions preserves the palm leaves. Peacock is also the vehicle for Murughun (Mars). So the subtle hint is that the great Lord Murughun helps preserve and protect this ancient knowledge. This is why there are so many Nadi readers outside one of Mars’s main places of power in Vaitheeswaran Koil.
There are other centre of Nadis. In Hoshiarpur, Punjab, a family og Bhrigu nadi readers are found.
There are many centres of Nadi in India. The main one remains in Vaitheeswaran Koil in Tamil Nadu. Due to the patronage of the Chola kings, Nadi Granthas were translated and kept in the library at Thanjavur, which is near Vaitheeswaran Koil. When the British sold them, most of these came to be in Vaitheeswaran Koil, where the Pullirukkuvelur Temple is dedicated to the healing powers of Shiva. Unlike most other temples that are known by the presiding deity, Lord Murughan is a celebrated deity in Vaitheeswaran Koil. Murughan is the son of Shiva, therefore comes from the same lineage.
The Nadi Jyotisha flourishes under the protection of Shiva and Murughan. They ply their traditional trade interpreting the knowledge of the Nadis and also telling of the upayes or remedies for the past karma. One should go for a Nadi reading with devotion. If you are skeptical about them, it is likely to bring you face to face with the wrong interpreter.
There are many texts of Nadi Jyotisha. Some give obscure and often secret techniques of Vedic Astrology. They give the key to precise interpretation. Among them include Bhrighu Nandi nadi, Bhrighu nadi, Chandra Kala Nadi, Sapta Rishi Nadi etc.
The Nadi readers are not astrologers but decoders of ancient scriptures. All they are doing is deciphering the data. His skills are limited to reading what is written. If the nadi leafs are incomplete or he has not found the right nadi or the time is not correct for you, then this information cannot be right. In fact the time has to be right for the individual to get the right nadi. This information is very precious and not everyone is ready to receive it. This is the reason so many get the wrong or incomplete information. The Rishis had only wanted those who were ready to receive information, to get it. In essence it is not the fault of the Nadi or the reader if you do not get the right information that chronicles the past, present and future.
Nadi reader tries to find the right Nadi by taking the thumb impression. According to the Nadi Granthas there are 1008 types of thumb impressions and these will narrow down the batch of Nadis where the story of your life is told. The impression of the right thumb for men and the left one for women is taken. The thumbprint has to match the particular batch of palm leafs for the reading to take place. Despite the claims of the nadi readers, it is impossible to find the right nadi for everyone.