Varahamihira's Observatory was built in the 6th century CE by the astronomer Varahamihira. It is located in Ujjain, Madhya Pradesh.

Jantar Mantar, Jaipur was built by Maharaja Jai Singh II in the 18th century CE. It is located in Jaipur, Rajasthan.

Jantar Mantar, Delhi was built by Maharaja Jai Singh II in the 18th century CE. It is located in Delhi.

Man Mandir Observatory, Varanasi was built by Maharaja Jai Singh II in the 18th century CE. It is located in Varanasi, Uttar Pradesh.

Jai Singh Observatory, Mathura was built by Maharaja Jai Singh II in the 18th century CE. It is located in Mathura, Uttar Pradesh.

Varahamihira's Observatory was built in the 6th century CE by the astronomer Varahamihira. It is located in Ujjain, Madhya Pradesh.

Aryabhata's Observatory was built in the 5th century CE by the astronomer Aryabhata. It is located in Pataliputra, Bihar.

Nalanda Observatory was built in the 5th century CE by the astronomer Nalanda. It is located in Nalanda, Bihar.

Vedashanga Observatory, Kanchipuram was built in the 6th century CE by the astronomer Vedashanga. It is located in Kanchipuram, Tamil Nadu.

Brihadeeswarar Temple Observatory, Thanjavur was built in the 11th century CE by the astronomer Rajaraja Chola I. It is located in Thanjavur, Tamil Nadu.

Meenakshi Temple Observatory, Madurai was built in the 17th century CE by the astronomer Tirumalai Nayak. It is located in Madurai, Tamil Nadu.

Nakshatravedi Observatory, Trivandrum was built in the 19th century CE by the astronomer John Caldecott. It is located in Trivandrum, Kerala.

Osmania University Observatory, Hyderabad was built in the 19th century CE by the astronomer Nizam of Hyderabad. It is located in Hyderabad, Telangana.

Vainu Bappu Observatory, Pune was built in the 20th century CE by the astronomer Vainu Bappu. It is located in Pune, Maharashtra.

Aryabhatta Research Institute of Observational Sciences, Nainital was built in the 20th century CE by the astronomer Aryabhatta. It is located in Nainital, Uttarakhand.