Nadi astrology is a form of traditional Indian astrology that originated in the Tamil region of South India. It is based on the belief that ancient sages or "Nadis" wrote down the destinies of all individuals on palm leaves, and these records can be deciphered by Nadi astrologers.

In Nadi astrology, individuals are categorized into specific groups based on their thumbprints or other personal details. Each group is said to have a unique set of palm leaf manuscripts that contain detailed predictions about the person's life, including past, present, and future events. A Nadi astrologer claims to read and interpret these palm leaf manuscripts to provide insights and guidance to the individual.