Jantar Mantar is an astronomical observatory built by Maharaja Jai Singh II of Jaipur in the year 1724. It is located in the modern city of New Delhi, India.It consists of 13 architectural astronomy instruments. The site is built by Maharaja Jai Singh II , from 1723 onwards, revising the calendar and astronomical tables.
Jantar Mantar is a UNESCO World Heritage Site and is a popular tourist destination. The observatory is open to the public and visitors can learn about the history and science of astronomy.
The instruments at Jantar Mantar are used to measure the positions of celestial bodies, such as the Sun, Moon, and stars. The instruments are made of stone, marble, and iron and are all aligned with the cardinal points.
The largest instrument at Jantar Mantar is the Samrat Yantra. It is a giant sundial that is 27 meters (89 feet) long and 19 meters (62 feet) wide. The Samrat Yantra can be used to measure the time of day, the declination of the Sun, and the position of the Sun in the sky.
Other notable instruments at Jantar Mantar include the Jai Prakash Yantra, the Ram Yantra, and the Mishra Yantra. The Jai Prakash Yantra is a large hemispherical astrolabe that is used to measure the altitude of celestial bodies. The Ram Yantra is a set of twelve instruments that are used to measure the time of day, the position of the Sun, and the phases of the Moon. The Mishra Yantra is a combination of several instruments that are used to measure a variety of astronomical phenomena.
Jantar Mantar is a testament to the ingenuity and scientific achievements of Maharaja Jai Singh II. It is a valuable historical and cultural site that is a must-see for visitors to New Delhi.