Vikramaditya, the legendary king of Ujjain, is known for his patronage of astronomy and the construction of several observatories, including the famous Jantar Mantar.

The Surya Siddhanta is an ancient Indian astronomical treatise that contains detailed descriptions of astronomical instruments and observations. It is one of the most important texts in the history of Indian astronomy.

Aryabhata, an Indian astronomer-mathematician, is credited with developing the heliocentric model of the solar system, which places the Sun at the center of the universe.

Jantar Mantar is the name of the famous astronomical observatory built by Maharaja Jai Singh II in Jaipur, India. It consists of a collection of architectural astronomical instruments that were used to study the movement of the Sun, Moon, and stars.

Raja Raja Chola I commissioned the construction of the Brihadeeswarar Temple in Thanjavur, India, which features intricate astronomical carvings.

Yantra is the name of the ancient Indian astronomical instrument used to measure the altitude of celestial objects.

Bhaskara II, an Indian astronomer-mathematician, is known for his work on trigonometry and the development of the sine table.

Ghati Yantra is the name of the ancient Indian astronomical instrument used to measure the time of day and night.

Brahmagupta, an Indian astronomer-mathematician, is known for his work on planetary motion and the development of the elliptical orbit model.

Dhruva Bhramana Yantra is the name of the ancient Indian astronomical instrument used to measure the angular distance between two celestial objects.

Varahamihira, an Indian astronomer-mathematician, is known for his work on calendar systems and the development of the solar calendar.

Kapala Yantra is the name of the ancient Indian astronomical instrument used to measure the declination of celestial objects.

Varahamihira, an Indian astronomer-mathematician, is known for his work on astrological predictions and the development of the horoscopic system.

Samrat Yantra is the name of the ancient Indian astronomical instrument used to measure the right ascension of celestial objects.

Aryabhata, an Indian astronomer-mathematician, is known for his work on eclipse predictions and the development of the eclipse calculation method.