Aryabhata

Aryabhata, also known as Aryabhata I, was an Indian mathematician and astronomer who flourished in the early 6th century CE. Traditional dating places him around 476 to 550 CE, with associations to Kusumapura (near Patna) in eastern India. His name became a byword for classical Indian science, and later scholars attributed many astronomical and mathematical ideas to him.

His most influential work is the Aryabhatiya, a concise treatise composed in verse around 499 CE. It surveys mathematics and astronomy, covering arithmetic, algebra, plane trigonometry, and spherical astronomy. The text presents methods for solving linear and quadratic equations, describes a decimal place-value numeral system, and introduces algorithms that influenced later computation.

In astronomy, Aryabhata proposed that the apparent motions of the heavens are a result of the rotation of the earth on its axis, explaining day and night and the seasonal changes. He offered models for the motions of planets and for eclipses, and he provided astronomical constants, including an approximation of pi of 3.1416. He also developed trigonometric concepts, including a table of sine values derived from half-chords, laying groundwork for later Indian and Islamic trigonometry.

Aryabhata’s work had a lasting influence on Indian astronomy and mathematics and was transmitted to the Islamic world, where it was studied and expanded. His ideas helped shape subsequent medieval scholarly traditions in South Asia and the broader scientific heritage of the region. The name Aryabhata was later used for the first Indian satellite, launched in 1975, as a tribute to his enduring legacy.