Jantar Mantar
Jantar Mantar is an important landmark of Delhi and a unique edifice. It is an observatory built by Sawai Jai Singh II, the erstwhile ruler of the princely state of Amber and a contemporary of the Mughal emperor Aurangzeb.

Constructed in 1724, the giant abstract masonry instruments of Jantar Mantar are the evident of the technological genius of the times in the field of astronomy. Jai Singh was a keen astronomer and a noble in the Mughal court. Several astronomical experiments were carried out at the massive Jantar Mantar that were utilized for creating astronomical tables that were later compiled Zij Muhhamad Shahi..

Architecture
This unique specimen of Indian architecture located at the very heart of Delhi's business district was built by Maharaja Sawai Jai Singh II of Jaipur in the year 1724. Jantar Mantar is one of the several observatories built by him and was used for astronomical observations. The observatory stands testament to the fact that quest for scientific knowledge and endeavor for development of science was very much active in the then India.

Instruments at Jantar Mantar
The samrat yantra consists of a massive triangle with a curved structure on both sides. The jaiprakash yantra is a two hemispherical bowl structure representing the celestial spheres and the use of a vertical rod in the center, giving different positions of celestial bodies during the day and night. The ram yantra is in the form of a high cylinder. It is surrounded by circular walls and the shadow of the sun on the vertical and horizontal marble gradations via the cylinder, indicates the altitude and the azimuth or declination of celestial bodies. The composite instrument is heart shaped and includes a sundial and a massive hemisphere on the northern wall. Sawai Jai Singh’s attempt to introduce a renaissance in astronomy through Jantar Mantar never took off due to chaos in the country. The first Indian Prime Minister Pandit Jawaharlal Nehru said that so accurate was his work that Jai Singh would have been remarkable anywhere. Thoroughly restored in 1901, the Jantar Mantar was declared a national monument in 1948.

How to Reach
By Air: The Indira Gandhi International Airport of Delhi has both domestic as well as international terminals. It is well connected to almost all the cities of the world as well as every city in India. Nearly all the major international airlines operate out of this airport.
By Rail: There are a number of railway stations in Delhi that connect it to almost each and every city in the country, major or minor. The three main railway stations in Delhi are that of New Delhi, Old New Delhi, and Nizamuddin. There is also the New Delhi Cantonment railway station that caters to luxury trains like the Palace-on-Wheels, Fairy Queen, and Royal Orient Express.
By Road: All the main cities of India are linked with Delhi by a network of highways and roads. The main three bus terminals in Delhi are the Inter State Bus Terminus (ISBT) at Kashmere Gate, Sarai Kale Khan Bus Terminus and Anand Vihar Bus Terminus. Various state-managed and privately run air-conditioned, deluxe and ordinary coaches operate in and out of Delhi on a daily basis.

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