Aryabhata was an ancient Indian astronomer and mathematician who lived in the 5th century CE. He is known for his treatise 'Surya Siddhanta', which is a comprehensive work on astronomy and mathematics.

Aryabhata was the first astronomer to propose the heliocentric model of the solar system, in which the Sun is at the center and the Earth and other planets revolve around it.

Aryabhata was the first astronomer to calculate the value of pi to four decimal places, which is an accurate approximation.

Brahmagupta was an ancient Indian astronomer and mathematician who lived in the 7th century CE. He developed a method for calculating the position of the planets, which was a significant contribution to astronomy.

Varahamihira was an ancient Indian astronomer and astrologer who lived in the 6th century CE. He wrote the treatise 'Brihat Samhita', which is a comprehensive work on astronomy, astrology, and other related topics.

Bhaskara II was an ancient Indian astronomer and mathematician who lived in the 12th century CE. He developed a method for calculating the time of sunrise and sunset, which was a significant contribution to astronomy.

Bhaskara II wrote the treatise 'Lilavati', which is a comprehensive work on mathematics. It covers topics such as arithmetic, algebra, geometry, and trigonometry.

Brahmagupta developed a method for calculating the area of a triangle, which is known as Brahmagupta's formula.

Aryabhata developed a method for calculating the volume of a sphere, which is known as Aryabhata's formula.

Bhaskara II wrote the treatise 'Siddhanta Shiromani', which is a comprehensive work on astronomy and mathematics. It covers topics such as spherical astronomy, planetary motion, and trigonometry.

Aryabhata developed a method for calculating the circumference of a circle, which is known as Aryabhata's formula.

Aryabhata developed a method for calculating the area of a circle, which is known as Aryabhata's formula.

Brahmagupta developed a method for calculating the volume of a cube, which is known as Brahmagupta's formula.

Brahmagupta developed a method for calculating the volume of a cylinder, which is known as Brahmagupta's formula.

Brahmagupta developed a method for calculating the volume of a cone, which is known as Brahmagupta's formula.