Imagine a place where giant stone instruments once tracked the movement of planets and measured time with the sun. Now imagine that same place becoming one of the most recognisable public spaces for people to gather, speak and be heard. 

That unlikely transformation is the story of Delhi’s Jantar Mantar — a site where science, history and civic life have intersected for more than 300 years.

Built to read the skies

Long before it became associated with public demonstrations, Jantar Mantar was an astronomical observatory. Commissioned by Maharaja Sawai Jai Singh II and completed in 1724, it was the first of five observatories he built across northern India, followed by those in Jaipur, Ujjain, Varanasi and Mathura.

Jai Singh was fascinated by astronomy and sought greater accuracy in celestial observations. Rather than relying solely on smaller instruments, he commissioned massive masonry structures designed to measure the position of celestial bodies, calculate time and improve astronomical tables used in calendars and navigation. 

The Delhi observatory became the starting point of this ambitious scientific network.

Even today, the geometric forms of Jantar Mantar stand apart from most of Delhi’s historic monuments. It is neither a fort nor a palace. Instead, it is a scientific monument — a rare reminder of India's rich tradition of astronomical........

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