Aryabhata is widely regarded as the father of Indian astronomy due to his significant contributions to the field. He proposed the heliocentric theory, calculated the value of pi, and developed trigonometric functions.

Aryabhata was the first astronomer to propose the theory of the Earth's rotation on its axis. This theory was later adopted by other astronomers, including Copernicus and Galileo.

Yantra is a general term for a variety of ancient Indian astronomical instruments used to measure the position of celestial bodies. These instruments were often made of metal or wood and had various designs.

Bhaskara II was the first astronomer to develop the concept of sine and cosine functions. He also developed a formula for calculating the area of a triangle.

Jantar Mantar is an ancient Indian astronomical observatory located in Delhi. It was built by Maharaja Jai Singh II in the 18th century and consists of a collection of architectural astronomical instruments.

Aryabhata calculated the value of pi to four decimal places, which was a significant achievement at that time.

Aryabhatiya is an ancient Indian astronomical text that contains the works of Aryabhata. It is considered one of the most important texts in the history of Indian astronomy.

Brahmagupta developed the theory of planetary motion, which was later adopted by Arab and European astronomers.

Quadrant is an ancient Indian astronomical instrument used to measure the altitude of celestial bodies. It is a quarter-circle with a graduated scale.

Brahmagupta developed the concept of zero and introduced it into the Indian number system.

Brahma Sphuta Siddhanta is an ancient Indian astronomical text that contains the works of Brahmagupta. It is considered one of the most important texts in the history of Indian astronomy.

Lagadha developed the theory of eclipses, which was later adopted by other astronomers.

Lagadha Siddhanta is an ancient Indian astronomical text that contains the works of Lagadha. It is considered one of the most important texts in the history of Indian astronomy.

Lagadha developed the theory of planetary conjunctions, which was later adopted by other astronomers.

Surya Siddhanta is an ancient Indian astronomical text that contains the works of Surya Siddhanta. It is considered one of the most important texts in the history of Indian astronomy.