The astronomer and mathematician Brahmagupta lived from 597 to 668 AD.

He was born in Bhinmal, Northwest India.

Though he was considered a poet, he also thought of himself as a mathematician.

He was the director of the observatory in Ujjain, which became a center of mathematical astronomy in Ancient India.

He spent most of his life studying mathematics, including the laws of probability.

In addition to solving equations, Brahmagupta studied mathematical systems, including systems of simultaneous equations.

He also considered systems of equations with two unknowns, such as quadratic equations

In addition to astronomy, Brahmagupta also wrote extensively about mathematical logic.

Brahmagupta's mathematical methods led to the discovery of the Earth's distance from the Sun.

He also discovered the formula for calculating the area of a four-sided figure.

He also developed an accurate method to calculate the length of a year and mentioned the importance of gravity, a property of all bodies falling toward the earth.

His work in mathematics was extensive and he was particularly noted for his contributions to geometry.

He wrote a famous formula for the area of a cyclic quadrilateral.

His work was also notable in astronomy, as he formulated equations to determine the celestial movements.