Jantar Mantar Jaipur

'Yantralaya' commonly known as Jantar Mantar was a dream of Swai Jai Singh II, a great astronomer of India. Jantar Mantar was built between 1716. It is located within the city palace. Jantar Mantar contains a collection of instruments for observing the movements of sun, moon, planets and stars. It was built to develop the interest of the people in Astronomy. Maharaja Swai Jai singh was an able ruler and a brilliant astronomer. Commissioned by Emperor Muhammad Shah, to correct the existing astronomical tables and fix planetary positions anew, Sawai Jai Singh-II, accomplished the task in seven years and for this task, built the first stone observatory in Delhi in 1724 and in Jaipur in 1728. Not only did the masonry instruments suit his purposes, they also satisfied his architectural instincts. Apart from being a permanent memorial to his genius, is secured for him a place along with such distinguished observatory builders like Prince Ulugh Beg, Tycho Brahe and John Flam steed.

Instruments

Samrat Yantra

Samrat Yantra consists of a massive triangle with a curved structure on both sides.

Ram Yantra

It is an instrument used to indicate the altitude and the azimuth or declination of celestial bodies. Jaya Prakesh Yantra is designed in the form of a high cylinder, surrounded by circular walls and the shadow of the sun falling on the vertical and horizontal marble gradations via the cylinder. The composite instrument is heart shaped and includes a sundial and a massive hemisphere on the northern wall.

Jai Prakesh Yantra

It is used to find out the positions of the celestial bodies during days and nights. It is a two hemispherical bowl structure, which represents the celestial sphere and there is a vertical rod in the center.

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