Aryabhata is widely regarded as the father of Indian astronomy. He lived in the 5th century CE and made significant contributions to the fields of astronomy, mathematics, and physics.

Aryabhata was the first Indian astronomer to propose that the Earth rotates on its axis. This idea was revolutionary at the time, as most people believed that the Earth was stationary.

Varahamihira was the first Indian astronomer to observe and record a supernova. He observed the supernova in the year 507 CE.

Brahmagupta developed a method for calculating the distance to the Moon. His method was based on the observation of lunar eclipses.

Varahamihira was the first Indian astronomer to write a book on astronomy in Sanskrit. His book, the Brihat Samhita, is a comprehensive treatise on astronomy and astrology.

Bhaskara II is known for his work on the precession of the equinoxes. He was the first astronomer to accurately calculate the rate of precession.

Brahmagupta was the first Indian astronomer to use algebra in his astronomical calculations. He used algebra to solve problems related to planetary motion and eclipses.

Aryabhata developed a method for calculating the time of sunrise and sunset. His method was based on the observation of the Sun's position in the sky.

Varahamihira was the first Indian astronomer to observe and record a comet. He observed the comet in the year 530 CE.

Bhaskara II is known for his work on the motion of the planets. He developed a model of planetary motion that was more accurate than the models of his predecessors.

Brahmagupta was the first Indian astronomer to develop a theory of gravity. His theory was based on the idea that objects attract each other with a force proportional to their masses.

Varahamihira is known for his work on the astrolabe. He wrote a book on the astrolabe that is considered to be one of the most important works on the subject.

Varahamihira was the first Indian astronomer to observe and record a solar eclipse. He observed the eclipse in the year 523 CE.

Varahamihira is known for his work on the lunar calendar. He developed a lunar calendar that was more accurate than the calendars of his predecessors.