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All That You Must Know About Jantar Mantar

Jantar Mantar is a major tourist attraction and monument located in Jaipur, Rajasthan. It is the largest observatory in the world and a heritage site as well. It has the largest stone sundial in the world. This observatory is nearby to Hawa Mahal and the City Palace. Jantar Mantar is famous for its collection of astronomical instruments made from brass and stone. Many design principles are explained in Sanskrit texts.


In the 18th century, Maharaja Sawai Jai Singh II who ruled Jaipur formed five observatories in northern India. These observatories are commonly referred to as Jantar Mantar. The other four are located in New Delhi, Mathura, Varanasi, and Ujjain. Each building is unique in its structure, type of astronomical instruments and functions. The structure of the building resembles geometric shapes.

Sawai Jai Singh was a Mughal nobleman of court and this collection of observatories was built to satiate the Mughal emperor’s astronomical thirst. These instruments have been used in the past to record main phenomena. The data was collected functionally for seven years from the end of the Observatory. The data was drawn to the emperor. After the death of the last Mogul emperor, Aurangzeb, Muhammad Shah took the throne.

Jantar Mantar was built to find the correct position of the planets to determine the right moment during each day. Initially, Jai Singh used brass instruments, which were not precise. Later, he adopted masonry tools. After the fall of the Shah, the work of the Observatory was stopped.

Attractions within Jantar Mantar

There are numerous instruments inside the monument.

Samrat Yantra: This is the largest sundial in the world. A large triangle that forms the sundial is 114 feet long and 70 feet high. The thickness is 10 ft. The sundial can measure time with the precision of half a second.

Jai Prakash Yantra: This is a collection of the hollow hemisphere with markings. The position of the stars can be determined by the marks.

Misra Yantra: This instrument is used to determine the shortest and the longest day of the year. This instrument can predict the exact midday in many places.

Rashuvalaya Yantra: This is an instrument to determine the eclipse and the circle of the zodiac.

Other important instruments are Ram Yantra, Niyati Chakra, Kapali Yantra, Digansh Yantra, Palbha Yantra, Nadivalaya Yantra, and others.


The monument is open from morning 10 am until night 6 pm. Admission is free and there is a minimum charge for cameras and video cameras. The monument is open throughout the year.

Best time to visit Jantar Mantar

It is an interior attraction and has no connection with nature, the place is in the main beauty throughout the year.

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