The Jantar Mantar, in Jaipur, is an astronomical observation site built in the early 18th century. It includes a set of some 20 main fixed instruments.

Where is the real Jantar Mantar?

Jantar Mantar located in New Delhi is built by Maharaja Jai Singh II of Jaipur in the year 1724. The maharaja built five observatories during his ruling time in the 18th century. Among these five the one in Delhi is the first to be built.

Where is the world's largest sundial located?

The Jaipur observatory in Rajasthan, which contains the Jantar Mantar instruments, is the largest and best preserved of the ancient Big Observatories. The Samrat Yantra (translation: Supreme Instrument) is the World's Largest Sundial.