Aryabhata, a renowned ancient Indian astronomer and mathematician, is credited with writing the Surya Siddhanta, a significant treatise on astronomy and mathematics.

Sawai Jai Singh II, the Maharaja of Jaipur, constructed the Jantar Mantar observatory in Jaipur, Rajasthan, India, during the 18th century.

Aryabhata, in his treatise, the Surya Siddhanta, proposed a heliocentric model of the solar system, where the Earth and other planets revolve around the Sun.

The ancient Indian observatory at Ujjain was called Vedhashala and was a significant center for astronomical studies and observations.

Aryabhata, in his treatise, the Surya Siddhanta, estimated the value of pi (π) to be approximately 3.1416, which is a remarkably accurate approximation.

The ancient Indian observatory at Delhi is known as Jantar Mantar and was constructed by Maharaja Jai Singh II in the 18th century.

Brahmagupta, in his treatise, the Brahmasphuta Siddhanta, developed a method for calculating the positions of planets and stars based on their mean motions.

The ancient Indian observatory at Varanasi was called Vedhashala and was a prominent center for astronomical studies and observations.

Bhaskara II, in his treatise, the Lilavati, focused on mathematics and astronomy, covering topics such as arithmetic, geometry, and astronomical calculations.

The ancient Indian observatory at Mathura was called Vedhashala and was a significant center for astronomical studies and observations.

Aryabhata, in his treatise, the Surya Siddhanta, developed a method for calculating the circumference of the Earth, which was remarkably accurate for its time.

The ancient Indian observatory at Nalanda was called Vedhashala and was a prominent center for astronomical studies and observations.

Varahamihira, in his treatise, the Brihat Samhita, covered topics such as astronomy, astrology, and architecture, demonstrating his diverse knowledge in various fields.

The ancient Indian observatory at Takshashila was called Vedhashala and was a significant center for astronomical studies and observations.

Aryabhata, in his treatise, the Surya Siddhanta, developed a method for calculating the time of sunrise and sunset, demonstrating his expertise in astronomical calculations.