Brahmagupta

Brahmagupta (c. 598 – c. 668 CE) was an Indian mathematician and astronomer. He is the author of two early

works on mathematics and astronomy: the Brāhmasphuṭasiddhānta (BSS, "correctly established doctrine of Brahma", dated 628), a theoretical treatise, and the Khaṇḍakhādyaka ("edible bite", dated 665)

Early Life
Brahmagupta was born in 598 CE according to his own statement. He lived in Bhillamāla in Gurjaradesa (modern Bhinmal in Rajasthan, India) during the reign of the Chavda dynasty ruler, Vyagrahamukha. He was the son of Jishnugupta and was a Hindu by religion, in particular, a Shaivite. He lived and worked there for a good part of his life. Prithudaka Svamin, a later commentator, called him Bhillamalacharya, the teacher from Bhillamala

Achievements
Brahmagupta  composed the following treatises:


 * Brāhmasphuṭasiddhānta, composed in 628 CE.
 * Khaṇḍakhādyaka, composed in 665 CE.
 * Grahaṇārkajñāna, (ascribed in one manuscript)


 * 1) The qualities of the number zero were established by Brahmagupta, which was critical for the development of mathematics and science.
 * 2) Found a method for solving quadratic equation
 * 3) Calculated that the Earth is closer to the Moon than the Sun.
 * 4) Brahmagupta mentioned “gravity.” “Bodies fall toward the earth because it is a fact that the earth attracts bodies, just as it does in the nature of water to flow,” he says
 * 5) Invented guidelines for working with positive and negative numbers
 * 6) Brahmagupta found the formula for Cyclic Quadrilateral.