Agasthiya Nadi Astrology works on the principle that the past, present, and future of every individual are recorded in ancient palm leaf manuscripts, known as Nadi Granthas. These manuscripts were written by sages thousands of years ago, and they contain detailed information about the lives of various individuals.

According to the principles of Agasthiya Nadi Astrology, each individual has a unique Nadi leaf that corresponds to their birth details. These leaves are said to be written in an ancient script that can only be deciphered by expert Nadi astrologers. The astrologers use the thumb impression of the individual to locate the specific Nadi leaf that contains their life details.

Once the Nadi leaf is identified, the astrologer reads the information written on it and provides insights into the individual's past, present, and future. The Nadi readings cover various aspects of life, including career, education, relationships, health, and spiritual growth.