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Jantar Mantar is very popular among tourists and residents of Delhi. The structure is another great masterpiece of Indian architecture, which shows the field of science in ancient India. Jantar Manter located in Parliament Street, close to Connaught Place. Jantar Mantar Delhi, also known as the Delhi Observatory.It is maintained by the Jaipur government because it was built by Maharaja Sawai Jai Singh II of Jaipur in 1710 A.D.

This is a remarkable structure, consisting of fourteen geometric devices used for measuring time, predicting climate change, predicting the behavior of the planets and find extraterrestrial altitude. All these devices are fixed structures and point to a specific address. The biggest feature is the instrument or Samrat Jantar that is 90 feet high and its shadow is drawn in such a way as to show the exact time of day. Any change in the weather or the onset of the monsoon can be prepared by the Indian Chhatri, which is a small dome-shaped structure.

The entire structure is made of stone and marble, with each scale were then recorded astronomical. Jantar Mantar was finally a national monument in 1948. It has always attracted architects, historians and researchers from around the world.

Maharaja Jai Singh was an astronomer fanatic himself, who has studied various works of Hindu, Muslim and European astronomy. He felt that the tables used by the experts was misleading and the actual change of the planets and predictions of eclipses were not possible with these measures. Then he thought he would find an improved means through which effective and accurate prediction can be done. It was his inspiration and vision that gave shape to such an instrument. He built other observatories at Jaipur, Ujjain, Benares and Mathura have a precise calculation. It took nearly seven years before the whole structure was fully operational, because he wanted to be fully satisfied with the accuracy of the instruments of Jantar Mantar.

Some of the major instruments at Jantar Mantar are:

The Samrat Yantra 'Prince of Dials' (the largest device)
The Ram Yantra - two circular buildings
The Jai Prakash
The Misra Yantra (north-west to the Samrat Yantra)
Pillars on the southwest of Mishra Yantra used to measure the shortest and longest days of the year.

Samrat Yantra measure the exact time of day. In addition, measured the declination is the sun, which can be seen as the shadow moves in the structure.

Jai Prakash shows the position of the sun at the equinox. There is a hole near the bottom of the structure that controls the sun once in a year which is March 21, called vernal eqinox.

Another important structure called the RAM Yantra is composed of two large buildings with a sunroof. Each of these two buildings form a complete device. The device is used to measure the height of the stars which is equivalent to the latitude and longitude on earth.

Northwest Prakash Yantra is a structure or an instrument called Mishra Yantra. It consists of five instruments. Columns in the southwestern part of Mishra Yantra is used to measure the shortest day (December 21) and the longest day (June 21) of the year.

There is no denying the fact that the structure does not represent the scientific heritage of India, but not used in modern scientific research. That said, we need to grant accreditation to Jantar Mantar for his scientific insight that could have harvested fruit was more motivation and adequate resources to research and development.