Rishi Sushrut is known as the father
of surgery & author of Sushrut Samhita. Circa 5 - 4th century BCE. He is credited with performing the world's first rhinoplasty, using anesthesia and plastic surgery. He used surgical instruments - many of them look similar to instruments used today; and discussed more than 300 types of surgical operations. One of the Ayurvedic surgical practices being used today in India involves dipping sutures into antibiotic herbs so when sewed into the person, the scar heals quicker and prevent infection. The modern surgical world owes a great debt to this great surgical sage.
Atomic theory
Sage Kanad (circa 600 BCE) is recognized as the founder of atomic theory, and classified all the objects of creation into nine elements (earth, water, light or fire, wind, ether, time, space, mind and soul). He stated that every object in creation is made of atoms(Anu) that in turn connect with each other to form molecules nearly 2,500 years before John Dalton. Further, Kanad described the dimension and motion of atoms, and the chemical reaction with one another. The eminent historian, T.N. Colebrook said, "Compared to scientists of Europe, Kanad and other Indian scientists were the global masters in this field."
In the field of chemistry alchemical metals were developed for medicinal uses by sage Nagarjuna. He wrote many famous books including Ras Ratnakar, which is still used in India's Ayurvedic colleges today. By carefully burning metals like iron, tin, copper, etc. into ash, removing the toxic elements, these metals produce quick and profound healing in the most difficult diseases.
Astronomy and Mathematics
Sage Aryabhatt (b. 476 CE) wrote texts on astronomy and mathematics. He formulated the process of calculating the motion of planets and the time of eclipses. Aryabhatt was the first to proclaim the earth was round, rotating on an axis, orbiting the sun and suspended in space. This was around 1,000 years before Copernicus. He was a geometry genius credited with calculating pi to four decimal places, developing the trigonomic sine table and the area of a triangle. Perhaps his most important contribution was the concept of the zero. Details are found in Shulva sutra. Other sages of mathematics include Baudhayana, Katyayana, and Apastamba.
Astronomy, Geography, Constellation
Science, Botany and Animal science.
Varahamihr (499 - 587 CE) was another eminent astronomer. In his book, Panschsiddhant, he noted that the moon and planets shine due to the sun. Many of his other contributions captured in his books Bruhad Samhita and Bruhad Jatak, were in the fields of geography, constellation science, botany and animal science. For example he presented cures for various diseases of plants and trees.
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