Jantar Mantar
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Jantar Mantar - India
Jantar Mantar is located in New Delhi, Delhi.
Jantar Mantar monument was established on 1710.
Primary threats to Jantar Mantar :

Observatory is consisting of mason-built astronomical instruments to chart the course of the heavens.

Historical facts of Jantar Mantar :

The Yantra Mandir is an equinoctial dial; consider a gigantic triangular gnomon with the hypotenuse parallel to the Earth's axis. On either side of the gnomon is a quadrant of a circle, parallel to the plane of the equator. The instrument is intended to measure the time of day, correct to half a second, and declination of the Sun and the other heavenly bodies. In the early 18th century, Maharaja Jai Singh II of Jaipur constructed five Yantra Mandirs in total, in Delhi, Jaipur, Ujjain, Mathura and Varanasi; and was completed between 1724 and 1735. The most famous Yantra Mandirs are Jantar Mantar, Jaipur and Jantar Mantar, Delhi. The name is derived from yantra, instrument, and mantra, for formula or in this context calculation. Therefore jantar mantar means literally calculation instrument. The yantras have evocative names like, samrat yantra, jai prakash, ram yantra and niyati chakra; each of which are used to for various astronomical calculations. The primary purpose of the observatory was to compile astronomical tables, and to predict the times and movements of the sun, moon and planets.