Aryabhata is widely regarded as the father of Indian astronomy due to his significant contributions to the field. He lived in the 5th century CE and is known for his work on topics such as planetary motion, eclipses, and trigonometry.

Aryabhata proposed the heliocentric model of the solar system, which places the Sun at the center and the planets revolving around it. This model was later adopted by European astronomers such as Copernicus and Galileo.

Brahmagupta developed the concept of zero and the decimal system in the 7th century CE. This was a major breakthrough in mathematics and astronomy, as it allowed for more accurate calculations and representations of numbers.

Varahamihira wrote the treatise 'Surya Siddhanta' in the 6th century CE. This text is considered one of the most important works in Indian astronomy and contains detailed descriptions of planetary motion, eclipses, and other astronomical phenomena.

Bhaskara II calculated the value of pi to four decimal places in the 12th century CE. This was a significant achievement, as it allowed for more accurate calculations in astronomy and other fields.

Varahamihira developed the concept of 'grahas' or planets in the 6th century CE. He identified nine planets, including the Sun and the Moon, and studied their movements and interactions.

Varahamihira wrote the treatise 'Panchasiddhantika' in the 6th century CE. This text compared five different astronomical systems and provided a comprehensive overview of the astronomical knowledge of his time.

Brahmagupta developed the 'chakravala' method for solving indeterminate equations in the 7th century CE. This method was later adopted by European mathematicians and is still used today.

Bhaskara II wrote the treatise 'Lilavati' in the 12th century CE. This text covered a wide range of mathematical topics, including arithmetic, geometry, and algebra, and is considered one of the most important works in Indian mathematics.

Aryabhata developed the 'Aryabhata system' of astronomy in the 5th century CE. This system included his heliocentric model of the solar system, as well as his calculations of the length of the year and the circumference of the Earth.

Bhaskara II wrote the treatise 'Siddhanta Shiromani' in the 12th century CE. This text covered a wide range of topics, including astronomy, mathematics, and astrology, and is considered one of the most important works in Indian astronomy.

Brahmagupta developed the 'Brahmagupta system' of astronomy in the 7th century CE. This system included his calculations of the positions of the planets and the eclipses of the Sun and the Moon.

Varahamihira wrote the treatise 'Brihat Samhita' in the 6th century CE. This text covered a wide range of topics, including astrology, astronomy, and architecture, and is considered one of the most important works in Indian literature.

Varahamihira developed the 'Varahamihira system' of astronomy in the 6th century CE. This system included his calculations of the positions of the planets and the eclipses of the Sun and the Moon.