The Jantar Mantar in Jaipur is one of the five astronomical observatories built by Maharaja Jai Singh II in the 18th century. It is a UNESCO World Heritage Site.

The Ujjain Observatory was one of the most important astronomical observatories in ancient India. It was founded by the astronomer Varahamihira in the 6th century CE.

The Nalanda Observatory was founded by the astronomer Aryabhata in the 5th century CE. It was one of the most important centers of astronomical research in ancient India.

The Takshashila Observatory was founded by the astronomer Panini in the 4th century BCE. It was one of the oldest astronomical observatories in ancient India.

The Varanasi Observatory was founded by the astronomer Bhaskaracharya in the 12th century CE. It was one of the most important astronomical observatories in ancient India.

The Delhi Observatory was founded by the astronomer Jai Singh II in the 18th century CE. It was one of the most important astronomical observatories in ancient India.

The Mathura Observatory was founded by the astronomer Aryabhata in the 5th century CE. It was one of the most important astronomical observatories in ancient India.

The Kanchipuram Observatory was founded by the astronomer Varadaraja in the 12th century CE. It was one of the most important astronomical observatories in ancient India.

The Thanjavur Observatory was founded by the astronomer Raja Raja Chola I in the 11th century CE. It was one of the most important astronomical observatories in ancient India.

The Kollam Observatory was founded by the astronomer Nilakantha Somayaji in the 15th century CE. It was one of the most important astronomical observatories in ancient India.

The Mysore Observatory was founded by the astronomer Maharaja Krishnaraja Wodeyar III in the 19th century CE. It was one of the most important astronomical observatories in ancient India.

The Hyderabad Observatory was founded by the astronomer Mir Osman Ali Khan in the 20th century CE. It was one of the most important astronomical observatories in ancient India.

The Visakhapatnam Observatory was founded by the astronomer C. V. Raman in the 20th century CE. It was one of the most important astronomical observatories in ancient India.

The Mumbai Observatory was founded by the astronomer Norman Lockyer in the 19th century CE. It was one of the most important astronomical observatories in ancient India.

The Chennai Observatory was founded by the astronomer John Goldingham in the 19th century CE. It was one of the most important astronomical observatories in ancient India.